Imagine a mass of floating waste is two times the size of the state of Texas. Texas has a land area of more than 678 000 square kilometers. So it might be difficult to imagine anything twice as big.
All together, this mass of waste flowing in the North Pacific Ocean is known as the Great Pacific Ocean Garbage Patch. It weighs about 3 500 000 tons. The waste includes bags，bottles and containers—plastic products of all kinds.
The eastern part of the Great Pacific Ocean Garbage Patch is about l 600 kilometers west of California. The western part is west of the Hawaiian Islands and east of Japan. The area has been described as a kind of oceanic desert，with light winds and slow moving water currents. The water moves so slow that garbage from all over the world collects there.
In recent years，there have been growing concerns about the floating garbage and its effect on sea creatures and human health. Scientists say thousands of animals get trapped in the floating waste，resulting in death or injury. Even more die from a lack of food or water after swallowing pieces of plastic. The trash can also make animals feel full，lessening their desire to eat or drink.
The floating garbage also can have harmful effects on people. There is an increased threat of infection of disease from polluted waste，and from eating fish that swallowed waste. Divers can also get trapped in the plastic.
Its existence first gained public attention in l997. That was when racing boat captain and oceanographer Charles Moore and his crew sailed into the garbage while returning from a racing event. Five years earlier，another oceanographer learned of the trash after a shipment of rubber duckies got lost at sea. Many of those toys are now part of the Great Pacific Ocean Garbage Patch.
In August，2009，a team from the University of California，San Diego became the latest group to travel to it. They were shocked by the amount of waste they saw. They gathered hundreds of sea creatures and water samples to measure the garbage patch’s effect on ocean environment.
小題1: How did the writer introduce the topic of the passage?
A．By giving an example.
B．By listing the facts.
C．By telling a story.
D．By giving a comparison.
小題2:What do we know about the Great Pacific Ocean Garbage Patch?
A．It is made up of various kinds of plastic products.
B．It is a solid mass of floating waste materials.
C．It lies l60 000 kilometers east of California.
D．It is described as a kind of oceanic desert.
小題3:Why do people pay attention to the Great Pacific Ocean Garbage Patch?
A．Because it may prevent the flow of ocean water.
B．Because the polluted plastic articles will move up the food chain.
C．Because it may be from an island in the pacific.
D．Because ships may be trapped in the floating waste.
小題4: The purpose of writing this passage is to____________.
A．warn people of the danger to travel in the pacific
B．a(chǎn)nalyze what caused the waste patch in the pacific
C．give advice on how to recycle waste in the ocean
D．introduce the Great Pacific Ocean Garbage Patch

小題1:D
小題2:A
小題3:B
小題4:D

試題分析：本文敘述了得克薩斯州有大量的垃圾漂浮物竟然是它的州面積的兩倍。這些垃圾漂流物是塑料制品，這些受污染的塑料制品會(huì)通過食物鏈來影響人類，它們也會(huì)對(duì)海洋中的生物以及人類的健康有影響。
小題1:推理判斷題。根據(jù)第一段”Imagine a mass of floating waste is two times the state of Texas. Texas has a land area of more than 678 000 square kilometers. So it might be difficult to imagine anything twice as big.”可知，作者拿得克薩斯州與大量的垃圾漂浮物進(jìn)行比較，所以選D項(xiàng)。
小題2:細(xì)節(jié)理解題。根據(jù)第二段中的”The waste includes bags，bottles and containers—plastic products of all kinds.”可知，這些垃圾漂流物是塑料制品。故選A。
小題3:細(xì)節(jié)理解題。根據(jù)第五段中的”There is an increased threat of infection of disease from polluted waste，and from eating fish that swallowed waste.”可知受污染的塑料制品會(huì)通過食物鏈來影響人類。故選B。
小題4:作者意圖題。本文通過介紹太平洋上漂浮的大量的塑料垃圾廢物的情況，指出了它們對(duì)海洋中的生物以及人類的影響，故選D。
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科目：高中英語 來源：不詳 題型：閱讀理解

The economic growth that many nations in Asia and increasingly Africa have experienced over the past couple of decades has transformed hundreds of millions of lives – almost entirely for the better. But there’s a byproduct to that growth, one that’s evident – or sometimes less than evident – in the smoggy, smelly skies above cities like Beijing, New Delhi and Jakarta. Thanks to new cars and power plants, air pollution is bad and getting worse in much of the world, and it’s taking a major toll (傷亡人數(shù)，代價(jià)) on global health.
How big? According to a new analysis published in the Lancet, more than 3.2 million people suffered deaths from air pollution in 2010, the largest number on record. That’s up from 800,000 in 2000. And it’s a regional problem: 65% of those deaths occurred in Asia, where the air is choked by diesel soot (內(nèi)燃發(fā)動(dòng)機(jī)煙霧) from cars and trucks, as well as the song from power plants and the dust from endless urban construction. In East Asia and China, 1.2 million people died, as well as another 712,000 in South Asia, including India. For the first time ever, air pollution is on the world’s top – 10 list of killers, and it’s moving up the ranks faster than any other factor.
So how can air pollution be so damaging? It is the very finest soot – so small that it roots deep within the lungs and then enters the bloodstream – that contributes to most of the public – health toll of air pollution including death. Diesel soot, which can also cause cancer, is a major problem because it is concentrated in cities along transportation zones affecting overpopulated areas. It is thought to contribute to half the deaths from air pollution in urban centers. Fro example, 1 in 6 people in the U.S. live near a diesel – pollution hot spot like a rail yard, port terminal or freeway.
We also know that air pollution may be linked to other non – deadly diseases. Fortunately in the U.S. and other developed nations, urban air is for the most part cleaner than it was 30 or 40 years ago, thanks to regulations and new technologies like the catalytic converters (催化式排氣凈化器) that reduce automobile emissions. Govemments are also pushing to make air cleaner – see the White House’s move last week to further tighten soot standards. It’s not perfect, but we’ve had much more success dealing with air pollution than climate change.
Will developing nations like India eventually catch up? Hopefully – though the problem may get worse before it gets better. The good news is that it doesn’t take a major technological advance to improve urban air. Switching from diesel fuel to unleaded (無鉛燃油) helps, as do newer and cleaner cars which are less likely to send out pollutants. Power plants – even ones that burn mineral fuels like coal – can be fitted with pollution – control equipment that, at a price, will greatly reduce smog and other pollutants.
But the best solutions may involve urban design. In the Guardian, John Vidal notes that Delhi now has 200 cars per 1,000 people, far more than much richer Asian cities like Hong Kong and Singapore. Developing cities will almost certainly see an increase in car ownership as residents become wealthier – and that doesn’t have to mean deadly air pollution. Higher incomes should also lead to tougher environmental regulations, which is exactly what happened in the West. We can only hope it happens before the death toll from bad air gets even higher.
小題1:What tends to give rise to the highest death toll according to the passage?
A．The lack of tight environmental protection standards.
B．The increasing numbers of the diesel cars and trucks.
C．The frighteningly high death rate from deadly cancer.
D．The world’s serious air pollution such as soot and dust.
小題2:The “byproduct” (Paragraph 1) most probably refers to     .
A．consequenceB．solutionC．reformD．design
小題3:The basic reason why so many people die from air pollution is that       .
A．the diesel soot is too small to be seen
B．the diesel soot is much too poisonous to breathe
C．the diesel soot roots in lungs and gets into blood
D．the diesel soot can also contribute to deadly cancer
小題4:According to the passage, the writer actually wants to convince the readers that        .
A．the global economic growth is mainly to blame for air pollution and climate change
B．the developing countries are repeating the same mistakes as the developed ones made
C．the ecological situation and air pollution in India are becoming worse and worse
D．the unbeatable air is increasingly becoming a major killer throughout the world
小題5:By describing urban design as “the best solution” in the last paragraph, the writer means that        .
A．the making of tougher environmental regulations alone is of little use
B．more sever regulations should be made to handle air pollution
C．the urban construction in western developed countries is the best choice
D．the pace of development has to be slowed down to reduce air pollution

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科目：高中英語 來源：不詳 題型：閱讀理解

Bicycle Safety

Operation　Always ride your bike in a safe, controlled manner on campus. Obey rules and regulations. Watch out for walkers and other bicyclists, and always use your lights in dark conditions.
Theft Prevention　Always securely lock your bicycle to a bicycle rack—even if you are only away for a minute. Register your bike with the University Department of Public Safety. It’s fast, easy, and free. Registration permanently records your serial number, which is useful in the possible recovery of the bike stolen.
Equipment
Brakes　Make sure that they are in good working order and adjusted properly.
Helmet　A necessity, make sure your helmet meets current safety standards and fits properly.
Lights　Always have a front headlight—visible at least 500 feet in front of the bike. A taillight is a good idea.
Rules of the Road
Riding on Campus　As a bicycle rider, you have a responsibility to ride only on streets and posted bicycle paths. Riding on sidewalks or other walkways can lead to a fine. The speed limit for bicycles on campus is 15 mph, unless otherwise posted. Always give the right of way to walkers. If you are involved in an accident, you are required to offer appropriate aid, call the Department of Public Safety and remain at the scene until the officer lets you go.
Bicycle Parking　
Only park in areas reserved for bikes. Trees, handrails, hallways, and sign posts are not for bicycle parking, and parking in such spots can result in a fine.
If Things Go Wrong
If you break the rules, you will be fined. Besides violating rules while riding bicycles on campus, you could be fined for:
×No bicycle registration…$25      ×Bicycle parking banned…$30
×Blocking path with bicycle…$40   ×Violation of bicycle equipment requirement…$35
小題1:Registration of your bicycle may help you 　　　.
A．find your stolen bicycleB．get your serial number
C．receive free repair servicesD．settle conflicts with walkers
小題2:According to the passage, what bike equipment is a free choice for bicycle riders?
A．Brakes.B．A helmet.C．A headlight.D．A taillight.
小題3:If you lock your bicycle to a tree on the campus, you could be fined 　　　.
A．$25B．$30C．$35D．$40
小題4: What is the passage mainly about?
A．A guide for safe bicycling on campus
B．Directions for bicycle tour on campus
C．Regulations of bicycle race on campus
D．Rules for riding motor vehicles on campus

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科目：高中英語 來源：不詳 題型：閱讀理解

You’ve bought what you need. The grocery cashier asks, “Will that be paper or plastic? You reply “Plastic, please.”
This seems like a simple question and there are plenty of reasons we choose plastic: easier to carry, lighter than paper bags, possibly less damaging to the environment, less expensive to the shop owners, able to be used as trash bag, and so on. There are different opinions on plastic and paper. Now let’s follow the travels of 3 plastic bags. It begins at the grocery store with the customer’s choice.
Plastic Bag 1: As the waste engineer come by and pick up the trash, the first plastic bag falls out. It sits on a small street for a couple of hours until a car comes along and takes it down to the road. Then a gust of wind blows it across the road, then another car, then another gust of wind finally makes its way to the beach. Water fills the plastic bag and makes it look like a jellyfish. A seal(海豹) swims by, thinking it looks very interesting, and swallowed it. The plastic bag may stay in the seal’s stomach for months, maybe years. You see, our lovely animals have been living thousands of years in a world where everything can be eaten.
Plastic Bag 2: This bag does make its way to landfill(垃圾場(chǎng)). Before they have a chance to cover up the thousands of pounds of daily waste, a strong wind comes up and blows these plastic bags out of the landfill. Once the wind stops, workers will be sent to collect thousands of bags around. But they can’t possibly get them all. So our little bag continues his adventure getting caught in trees, eaten by birds or making its way to our lakes or rivers.
Plastic Bag 3: The last bag also blows away but is caught in a landfill where it sits for many years, as all the trash is wrapped in a big plastic bag, making natural degradation(降解) impossible. Although workers do much work to make sure water and air system won’t be polluted, some do. Guess what, plastic bags are made from petrol, a harmful waste material, which in one way or another makes its way to the environment.
Another problem with putting plastic bags in out trash is that our landfills for most cities may be filled in about 20 years. More importantly, since we are running out of land to build homes, you might have the pleasure of one day living on top of your plastic bags!
One of the best suggestions is not to use a bag at all or bring your own cloth bags. If you must, please choose paper bags, which, though not suggested, can be eaten by animals. And there are more opportunities recycle paper bags. It does take a little extra effort. But please have a thought about the little seal next time you say, “Plastic please.”   
小題1:According to the passage, what is NOT the reason for a customer to choose plastic bags?
A．He can use plastic bags to carry trash later.
B．He finds paper bags heavier than plastic bags.
C．He finds plastic bags more convenient to carry.
D．He can save money for plastic bags are cheaper.
小題2:The author describes the travel of Plastic Bag 1 to show ______.
A．seals like eating plastic bags around them.
B．seals really have a good stomach.
C．seals are potential victims of plastic bags.
D．seals are not able to differ plastic from food.
小題3:Wrapped in a big plastic bag, Plastic Bag3_____.
A．still does harm to the environment
B．can hardly be harmful to the environment
C．is much safer than Plastic Bag2
D．will end up being eaten by seals or some fish
小題4:What will the following part of this passage talk about?
A．Suggestions on reducing harm of plastic bags.
B．Disadvantages of using too many plastic bags.
C．Persuading people into using paper bags.
D．Other potential victims of plastic bags.
小題5:What is the overall tone of this passage?
A．ExcitedB．SeriousC．IronicalD．Casual

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科目：高中英語 來源：不詳 題型：閱讀理解

This year’s Newsweek list of the top 100 high schools shows that today those with fewer students are rising.
Ten years ago, when the first Newsweek Top School List based on college-level test participation was published, only three of the top 100 schools had graduating classes smaller than 100 students. This year there are 22.
Fifty years ago, they were the latest thing in educational reform: big, modern high schools outside the cities with thousands of students. Big schools meant economic efficiency, a greater choice of courses, and better football teams. But only years later did we understand that it involved the difficulty of strengthening personal connections between teachers and students. SAT scores began dropping; on average, 30% of students did not complete high school in four years, a figure that rose to 50% in poor city neighborhoods. High schools for a variety of reasons seemed to have made little progress.
Size isn’t everything, but it does matter, and the past decade has seen a noticeable trend toward smaller schools. This has been partly due to the Bill and Melinda Gates Foundation, which has invested $1.8 billion in American high schools, helping to open about 1,000 small schools — most of them with about 400 kids, each with an average enrollment of only 150 students per grade. About 500 more are on the drawing board. Districts all over the country are taking notice, along with mayors in cities like New York, Chicago and San Diego. And most noticeable of all, there is the phenomenon of large urban and suburban high schools that have split up into smaller units of a few hundred.
Hillsdale High School in San Mateo, California, is one of those ranking No.423 — among the top 2% in the country. In 2003, Hillsdale remade itself into three “houses”. 300 students arriving ninth graders are randomly assigned to one of the houses, where they will keep the same four core subject teachers for two years before moving on to another for 11th and 12th grades. Teachers meet with students in groups of 25, five mornings a week, for open-ended discussions of everything from homework problems to bad Saturday-night dates. The advisers also meet with students privately and stay in touch with parents. Along with the new structure came the percentage of freshmen taking biology jumped from 17 to 95.”It was rough for some. But by senior year, two-thirds have moved up to physics,” says Jeff Gilbert. “Our kids are coming to school in part because they know there are adults here who know them and care for them.”
But not all schools show advances after downsizing, and it remains to be seen whether smaller schools will be a cure-all solution.
Ranking schools is always controversial. Over the years this system has been criticized for its simplicity — list of top U.S. high schools was made merely according to the proportion of students taking college-level exams. This year a group of 38 superintendents (地區(qū)教育主管) from five states wrote to ask that their schools should be excluded from the calculation. “It is impossible to know which high schools are ‘the best’ in the nation,” their letter read. “Determining whether different schools do or don’t offer a high quality of education requires a look at many different measures, including students’ overall academic accomplishments, their later performance in college, and taking into consideration the unique needs of their communities.”
小題1:What can we learn about the schools sponsored by the Bill and Melinda Gates Foundation?
A．They are often located in poor neighborhoods.
B．They are popular with high-achieving students.
C．They are mostly small in size.
D．Another 150 schools invested by the Foundation are planned to be set up.
小題2:According to Jeff Gilbert, the classes at Hillsdale were set up so that students could ______.
A．tell their teachers what they did on weekends
B．experience a great deal of pleasure in learning
C．maintain closer relationships with their teachers
D．deal with the demanding biology and physics courses
小題3:Newsweek ranks high schools according to ______.
A．their students’ academic achievement
B．the number of their students admitted to college
C．the size and number of their graduating classes
D．their college-level test participation
小題4:What attitude does the author have towards the present trend in high school education?
A．Subjective.B．Objective.C．Indifferent.D．Disapproving.
小題5:Which of the following can be the best title for the passage?
A．Providing Good Education for Baby Boomers
B．Top School List Winning National Support
C．Small Schools Rising in popularity
D．Students Meeting Higher Academic Standards

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科目：高中英語 來源：不詳 題型：閱讀理解

Last week Jay McCarroll and The HSUS (The Humane Society of the United States) made a bold fur-free statement on the runway, marking a new chapter for the fashion industry and animal protection. The encouraging response to McCarroll’s show confirmed that change is happening in fashion.
McCarroll has good reasons for rejecting fur. Each year, tens of millions of amimals, including dogs and cats, needlessly suffer and die to fuel the fur industry. But what did Jay McCarroll use in place of fur?“I have patchwork pieces that contain all sorts of combinations of fabrics. The rest is cotton, nylon, polyester…you name it. I even have some stuff made out of bamboo / cotton blend. Anything but fur and leather,”he told Fashion Wire Daily.
“So many people want to protect animals and live their lives without causing unnecessary cruelty. More than two thirds of Americans have pets, and we share a bond with animals every day. Saying no to fur can help millions of animals, and we want to show our respect to leading designers like Jay who embrace compassion(同情) as the fashion,”said Michael Markarian, executive vice president of The HSUS.“It is great to see leaders in the fashion industry recognizing that the animals need their fur more than we do.”
小題1:Which of the following is true about Jay McCarroll?
A．He is a famous fashion designer.
B．He is the executive vice president of the HSUS.
C．He is an editor of Fashion Wire Daily.
D．He is the head of an animal protection organization.
小題2:What does“a new chapter”in line 2,paragraph 1 mean?
A．A new unit of a book.B．The beginning of a new trend.
C．The latest issue of a magazine.D．A newly established organization.
小題3:Which of the following is NOT recommended for clothing by Jay McCarroll?
A．Polyester.B．Bamboo.C．Leather.D．Patchwork pieces.
小題4:What do we learn from this passage?
A．Human beings depend emotionally on animals.
B．Fashion can go hand in hand with compassion for life.
C．Fur is more effective than bamboo/cotton blend for clothing.
D．Fur is more expensive than other materials for fashion designers.

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科目：高中英語 來源：不詳 題型：閱讀理解

When someone says “SHARK” most people think of a big, toothy, underwater animal; basically we are imagining a Great White. In fact sharks come in all shapes, sizes and even colors! Follow me please; I’d like to show you a very special small shark commonly known as horn sharks, only found in the coastal waters of north-west North America.
Look at this shark, and you can easily see the horns on it and you will know the reason why it is called the horn shark is that it has the broad, flattened head and two large horn-like spines(脊椎) found behind its eyes and makes it one of the hardiest of all shark species. What makes it unique is that as its enemy attempts to swallow it, the spines on its back will stick into the enemy’s mouth and give a good chance for it to get away.
The horn shark is brown in color with black spots all over its body. The adults can reach up to a length of 4 feet and weigh up to 10 kg. An interesting fact about the horn shark is that it has five gills(鰓). The horn shark is a clumsy swimmer using its flexible pectoral fins(胸鰭)to push itself along the bottom of the ocean. The maximum distance that has ever been recorded for a horn shark to have traveled out from its habitat is 10 miles.
Today, as so little is known about its population off the Californian coast, they have been listed as being “Data Deficient” in the World Conservation Union. The horn shark is being threatened both by water pollution and commercial fishing in the area. Though they are not among those sea creatures hunted primarily for food, but they often get caught as a by-catch in fishing expeditions.
小題1:The horn shark gets its name for______.
A．its small sizeB．its large eyes
C．its two large spinesD．its brown color with spots
小題2:How is paragraph 3 mainly developed?
A．By giving descriptionsB．By following time order
C．By analyzing causesD．By making comparisons
小題3:Which factors contribute to the horn shark’s being on the “Data Deficient” list?
①That people like hunting them for pets       ②That people fish them for fun
③Water pollution off the coast               ④Knowing little about them
A．①②B．②③C．①④D．③④
小題4: According to the passage, all of the following are unique to the horn shark EXCEPT that_____.
A．it doesn’t travel far
B．it is good at swimming
C．its spines can be used to attack the enemy and escape
D．it is only found in the coastal waters of north-west North America

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科目：高中英語 來源：不詳 題型：閱讀理解

A team of engineers at Harvard University has been inspired by Nature to create the first robotic fly. The mechanical fly has become a platform for a series of new high-tech integrated systems. Designed to do what a fly does naturally, the tiny machine is the size of a fat housefly. Its mini wings allow it to stay in the air and perform controlled flight tasks.
“It’s extremely important for us to think about this as a whole system and not just the sum of a bunch of individual components (元件),” said Robert Wood, the Harvard engineering professor who has been working on the robotic fly project for over a decade. A few years ago, his team got the go-ahead to start piecing together the components. “The added difficulty with a project like this is that actually none of those components are off the shelf and so we have to develop them all on our own,” he said.
They engineered a series of systems to start and drive the robotic fly. “The seemingly simple system which just moves the wings has a number of interdependencies on the individual components, each of which individually has to perform well, but then has to be matched well to everything it’s connected to,” said Wood. The flight device was built into a set of power, computation, sensing and control systems. Wood says the success of the project proves that the flying robot with these tiny components can be built and manufactured.
While this first robotic flyer is linked to a small, off-board power source, the goal is eventually to equip it with a built-in power source, so that it might someday perform data-gathering work at rescue sites, in farmers’ fields or on the battlefield. “Basically it should be able to take off, land and fly around,” he said.
Wood says the design offers a new way to study flight mechanics and control at insect-scale. Yet, the power, sensing and computation technologies on board could have much broader applications. “You can start thinking about using them to answer open scientific questions, you know, to study biology in ways that would be difficult with the animals, but using these robots instead,” he said. “So there are a lot of technologies and open interesting scientific questions that are really what drives us on a day to day basis.”
(392 words)
小題1:The difficulty the team of engineers met with while making the robotic fly was that __________.
A．they had no model in their mind
B．they did not have sufficient time
C．they had no ready-made components
D．they could not assemble the components
小題2:It can be inferred from paragraphs 3 and 4 that the robotic fly __________.
A．consists of a flight device and a control system
B．can just fly in limited areas at the present time
C．can collect information from many sources
D．has been put into wide application
小題3:Which of the following can be learned from the passage?
A．The robotic flyer is designed to learn about insects.
B．Animals are not allowed in biological experiments.
C．There used to be few ways to study how insects fly.
D．Wood’s design can replace animals in some experiments.
小題4:Which of the following might be the best title of the passage?
A．Father of Robotic Fly
B．Inspiration from Engineering Science
C．Robotic Fly Imitates Real Life Insect
D．Harvard Breaks Through in Insect Study

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科目：高中英語 來源：不詳 題型：閱讀理解

When you practice reading with passages shorter than book length, do not try to take in each word separately, one after the other. It is much more difficult to grasp the broad theme of the passage this way, and you will also get the stuck on individual words which may not be absolutely essential to a general understanding of the passage. It is a good idea to skim through the passage very quickly first to get the general idea of each paragraph. Titles, paragraph headings and emphasized word can be a great help in getting this skeleton outline of the passage. It is surprising how many people do not read titles, introductions or paragraph headings. Can you, without looking back, remember the title of this passage and the heading of this paragraph?
Most paragraphs of a passage or chapter have a 'topic sentence' which expresses the central idea. The remaining sentence expand or support that idea. It has been estimated that between 60% and 90% of all expositive（說明的）paragraphs in English have the topic sentence first. Always pay special attention to the first sentence of a paragraph; it is most likely to give you the main idea.
Sometimes , though , the first sentence in the paragraph does not have the feel of 'main idea' sentence. It does not seem to give us enough new information to justify a paragraph. The next most likely place to look for the topic sentence is the last sentence of the paragraph.
Remember that the opening and closing paragraphs of a passage or chapter are particularly important . The opening paragraph suggests the general direction and content of the piece, while the closing paragraph often summarizes the very essence （精髓）.
小題1:It is a good idea to skim through a passage quickly first ________.
A．a(chǎn)t about 350 w. P.m.(words per minute)
B．to get the general idea of each paragraph
C．so that you can take in each word separately
D．to make sure you get to the end at least once
小題2:The topic sentence of an expository paragraph in English_______.
A．usually comes in the middle
B．is most likely to be found at the end
C．is most often at the beginning
D．is usually left out in expository writing
小題3:Most expository paragraphs in English have a clearly defined topic sentence. In such paragraphs the topic sentence comes first ________.
A．in about 40% of casesB．in about 80% of cases
C．in about 20% casesD．very rarely
小題4:Some times we know the first sentence is not the topic sentence because ________.
A．it does not seem to give us enough new information
B．it is not long enough
C．it does not come at the beginning
D．it does not make complete sentence

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