精英家教網 > 高中英語 > 題目詳情

What makes it rain? Rain falls from clouds for the same reason anything falls to Earth. The Earth's gravity pulls it. But every cloud is made of water droplets or ice crystal(冰晶). Why doesn't rain or snow fall constantly from all clouds? The droplets or ice crystals in clouds are extremely small. The effect of gravity on them is slight. Air currents move and lift droplets so that the net downward amount of water is zero, even though the droplets are moving constantly.
It can be seen that droplets and ice crystals behave somewhat like dust in the air in a beam of sunlight. To the casual observer, dust seems to act in a totally random fashion, moving about
without fixed direction. But in fact dust particles（分子） are much larger than water droplets and they finally fall. The average size of a cloud droplet is only 0.0004 inch in diameter（直徑）. It is so small that it would take sixteen hours to fall half a mile in perfectly still air, and it doesn't fall out of moving air at all. Only when the droplet grows to a diameter of 0.008 inch or larger can it fall from the cloud. The average raindrop contains a million times as much water as a tiny cloud droplet. The growth of a cloud droplet to a size larger enough to fall out is the cause of rain and other forms of precipitation. This important growth process is called "coalescence".
小題1: Ice crystals do NOT immediately fall to Earth because           .
A．they are kept up by air currents
B．most of them change into steam
C．they combine with other chemicals in the atmosphere
D．their electrical charges draw them away from the earth
小題2: The underlined word "random" in line 10 most probably means            .
A．unpredictableB．strictC．independentD．abnormal
小題3:What can be inferred about drops of water larger than 0.008 inch in diameter?
A．They never occur.
B．They are not affected by the force of gravity.
C．In moving air they would fall to earth.
D．In still air they fall a speed of thirty-two miles per hour.
小題4: How much bigger is the rain drop than a loud droplet?
A．200 times bigger
B．1,000 times bigger
C．100,000 times bigger
D．1,000,000 times bigger
練習冊系列答案
相關習題

科目：高中英語 來源：不詳 題型：閱讀理解

The Winter Olympics is also called the White Olympics. At this time, many colorful stamps are published to mark the great Games. The first stamps marking the opening came out on January 25, 1932 in the United States for the 3rd White Olympics. From then on, publishing stamps during the White Olympics became a rule.
During the 4th Winter Olympic Games a group of stamps were published in Germany in November 1936. The five rings of Olympics were drawn on the front of the sportswear. It was the first time that the rings had appeared on the stamps of the White Olympics.
In the 1950’s, the stamps of this kind became more colorful. When the White Olympics came, the host countries as well as the non-host countries published stamps to mark those Games. China also published four stamps in February 1980, when the Chinese sports men began to take part in the White Olympics.
Japan is the only Asian country that has ever held the White Olympics. Altogether 14,500 million stamps were sold to raise money for this sports meet.
Different kinds of sports were drawn on these small stamps. People can enjoy the beauty of the wonderful movements of some sportsmen.
小題1: We can infer from the passage that ______.
A．No stamps were printed in the first two White Olympics
B．The first stamps marking the opening came out for the 3rd White Olympics
C．The 3rd White Olympics was in the USA
D．The 3rd White Olympics were held in 1932
小題2: The world made it a rule to publish stamps to mark the great world games _____.
A．after the year 1936B．after the 3rd White Olympics
C．before the 3rd White OlympicsD．before the year 1932
小題3: The Winter Olympics is held once _______.
A．every two yearsB．every three years
C．every four yearsD．every five years
小題4:Which of the following is TRUE?
A．Only the host countries can publish stamps to mark those Games.
B．Only the non-host countries can publish stamps to mark those Games.
C．All the countries can publish stamps to mark those Games.
D．Japan can’t publish stamps to mark those Games
小題5: What may appear on the stamps of the White Olympics?
A．Basketball.B．Table tennis.C．Football.D．Skating.

查看答案和解析>>

科目：高中英語 來源：不詳 題型：完形填空

Unemployment will certainly be in double-digits next year--and may remain there for some time. And for every person who __1_ as unemployed in the Bureau of Labor Statistics’ household survey, you can bet there’s another either too __2__ to look for work or working part time who’d rather have a full-time job or else taking home less pay than before. And there’s yet another person who’s more fearful that he or she will be the __3__ to lose a job.
__4__, 10 percent unemployment really means 20 percent underemployment or anxious employment, all of which translates __5__ into late payments on mortgages, credit cards, auto and student loans, and loss of health insurance. It also means sleeplessness for tens of millions of Americans, and, of course, __6__ purchases.
Unemployment of this magnitude and duration also translates into ugly __7__, because fear and anxiety are __8__ grounds for the political resentment against immigrants, blacks, the poor, government leaders, business leaders, Jews and other easy _9__. It’s already started. Next year is a mid-term election. Be prepared for worse.
So why is unemployment and underemployment so high? And why is it _10__ to remain high for some time? Because, as noted, people who are worried about their jobs or have no jobs, and who are also trying to _11__ from under a pile of debt, are not going to do a lot of shopping. And businesses that don’t have customers aren’t going to do a lot of new _12__. And foreign nations also suffering high __13__ aren’t going to buy a lot of our goods and services. And without customers, companies won’t __14__. They’ll cut payrolls instead.
This brings us to the obvious question: Who’s going to buy the stuff we make or the services we provide, and therefore bring jobs back? There’s only one __15__ left: The government.
小題1:
A．keeps toB．sticks toC．shows upD．attaches
小題2:
A．discouragedB．timidC．sureD．upset
小題3:
A．firstB．nextC．lastD．only
小題4:
A．On the other handB．By contrastC．As a wholeD．In other words
小題5:
A．enormously B．definitelyC．exactlyD．directly
小題6:
A．fewerB．moreC．betterD．worse
小題7:
A．economicsB．tradesC．politicsD．industries
小題8:
A．necessaryB．fertileC．scarceD．heated
小題9:
A．opponentsB．targetsC．victimsD．potentials
小題10:
A．dueB．ableC．equalD．likely
小題11:
A．get outB．get aroundC．get intoD．get off
小題12:
A．programmingB．planningC．investingD．advertising
小題13:
A．signatureB．unemploymentC．crisisD．inefficiency
小題14:
A．rentB．runC．sellD．hire
小題15:
A．manufacturerB．applicantC．buyerD．employer

查看答案和解析>>

科目：高中英語 來源：不詳 題型：完形填空

完形填空（共20小題；每小題1.5分，滿分30分）
閱讀下面短文，掌握其大意，從第每題所給的A、B、C、D四個選項中，選出最佳選項
How often do you let other people’s nonsense change your mood? The mark of a successful person is how   36  he can get back his focus on what is important.
Two years ago I gained the knowledge about the Law of the Garbage Truck. I   37  it in a taxi. I got on a taxi, and we headed for Grand Central Station. We were  38 in the right lane(行車道) when   39 a black car jumped out of a parking space right in front of us. My taxi driver stepped on his brakes(剎車)heavily, and    40  the car’s back end by just inches!
The driver almost caused a(n)   41 , saying bad words at us. My taxi driver just smiled and waved at the guy  42   . So, I said, “This guy almost   43  your car and sent us to the   44  !” On the way to the Grand Central Station, my taxi driver told me what I now   45  “The Law of the Garbage Truck.”
“Many people are like garbage trucks. They run around full of   46  , full of frustration, full of anger, and full of disappointment. As their garbage becomes more, they needed a(n)   47 to dump(扔) it. When someone wants to dump it on you, don’t   48  it. You just smile, wish them well, and focus on important things quickly.
Good leaders know they have to be  49 for their next meeting. Good parents know that they have to welcome their children home from school with hugs and kisses. Good  50 and parents know what is   51 for them. The bottom line is that   52 people do not let garbage Trucks take over their day.
Life is too   53 to wake up in the morning with  54 , so take your time and love the people who treat you right.  55 about the ones who don’t. Don’t be regretful for your life.
小題1:.
A．quickly
B．hardly
C．completely
D．directly
小題2:.
A．realized
B．observed
C．concluded
D．learned
小題3:
A．walking
B．driving
C．running
D．talking
小題4:
A．suddenly
B．slowly
C．secretly
D．finally
小題5:.
A．struck
B．hit
C．approached
D．missed
小題6:
A．argument
B．fire
C．accident
D．debate
小題7:
A．impatiently
B．friendly
C．angrily
D．impolitely
小題8:
A．destroyed
B．stole
C．burned
D．caught
小題9:
A．station
B．office
C．park
D．hospital
小題10:
A．imagine
B．believe
C．call
D．expect
小題11:
A．energy
B．garbage
C．happiness
D．possibility
小題12:
A．assistant
B．chance
C．tool
D．place
小題13:
A．value
B．refuse
C．mind
D．ignore
小題14:
A．ready
B．eager
C．anxious
D．suitable
小題15:
A. teachers
B doctors
C. drivers
D. leaders
小題16:
A．useful
B．important
C．necessary
D．dangerous
小題17:.
A．successful
B．busy
C．silly
D．common
小題18:.
A．long
B．hard
C．short
D．exciting
小題19:
A．aims
B．dreams
C．hopes
D．regrets
小題20:
A. Point
B. Forget
D. Wonder
D. Dream
 

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

Time spent in a bookshop can be most enjoyable, whether you are a book-lover or merely you are there to buy a book as a present. You may even have entered the shop just to find shelter from a sudden shower. Whatever the reason, you can soon become totally unaware of your surroundings. You soon become engrossed in some book or other, and usually it is only much later that you realise you have spent far too much time there and must dash off to keep some forgotten appointment—without buying a book, of course.
This opportunity to escape the realities of everyday life is, I think, the main attraction of a bookshop. There are not many places where it is possible to do this. You can wander round such places to your heart's content. If it is a good shop, no assistant will disturb you with usual greetings, "Can I help you, sir?" Of course you may want to find out where a particular section is. Then, and only then, are his services necessary. However, when he has led you there, the assistant should retire carefully and look as if he is not interested in selling a single book.
You have to be careful not to be attracted by the variety of books in a bookshop. It is very easy to enter the shop looking for a book on ancient coins and to come out carrying a copy of the latest best-selling novel. This sort of thing can be very dangerous. Apart from running up a huge account, you can waste a great deal of time wandering from section to section.
小題1:.
. Which may not be included in the writer's experiences while he is in a bookshop?
A．Getting relaxed without buying a book.
B．Quarrelling with the shop assistant.
C．Buying other books instead of those he wanted.
D．Forgetting some important appointment.
小題2:.
. What does the writer mean by saying "time spent in a bookshop can be most enjoyable"?
A．You may free yourself from the real life.
B．Reading is free of charge there.
C．There is nobody disturbing you there.
D．You can enter without any certain reason.
小題3:.
What does the underlined wordengrossed most probably mean in the first paragraph?
A．Lost.B．Forbidden.C．Puzzled.D．Impressed.
小題4:.
. The writer wrote the passage in order to ________.
A．suggest a good way of running a bookshop
B．encourage people to do some reading in bookshops
C．share his experience in bookshops
D．give some advice on buying books in a bookshop

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

The first MP4 player was born years ago. Soon many music fans were wondering how fantastic it is! If you have been into technology enough, perhaps you may have a knowledge of the MP4. If not, you do need to know something before buying one, even if you are familiar with MP3. MP3 is the CD-like disc with greater capacity. How about MP4? This small digital product will really enrich the joy from listening to music. You can even feel the “touch” of music to your soul!
Now, some similar digital products advertised as “MP4 player” are simply MP3 players, which do not play video and MPEG format and also lack other particular functions. These products confuse some buyers, as they may think the “MP4” players simply mean they can do more than MP3.
What is MP4?
It is a multimedia container. It is not only used to store digital audio and digital video streams, especially those of MPEG, but can also be used to store other data such as subtitles and pictures. As a most modern container format, it allows streaming over the Internet.
With the help of a piece of MP4 video equipment, you can change various programs such as MPEG to MP4, ASX to MP4, AVI to MP4 and so on, which can be done very quickly and easily without any effect on the sound quality. By installing DVD-MP4 software, you can transfer particular music from a DVD to an MP4 video file. It really excites your listening music experience.
Then, there is MP4 advanced and you can set your own collection of all the programs—TV shows, games, and music. You can even see movies which are still running in cinema. What else digital product could you possibly ask for?
小題1:. It is suggested here that you should ______ before buying an MP4 player.
A．first be a music fanB．have a knowledge of MP4
C．get familiar with MP3D．buy a CD-like disc
小題2:. From the passage, we can see that MP4 is ______ MP3.
A．much bigger thanB．just as advanced as
C．not so particular asD．more functional than
小題3:.Which function of MP4 is NOT directly mentioned in this passage?
A.Storing digital audio and video streams.
B.Recording some movies in cinema.
C.Playing TV shows, games and movies.
D.Transferring particular music from a DVD.
小題4:.From the last sentence, it’s clear that the writer tries to tell us it is ______.
A．reasonable to buy other digital products
B．impossible to buy something else
C．a very wise choice to buy an MP4
D．an exciting experience to buy an MP3

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

It is a hot summer day，and you feel thirsty．A friend gives you a glass of cold lemonade．How do you feel when you see the glass? Will you describe your feeling as happiness or as pleasure? I believe you will say it is a feeling of pleasure．There is a connection between these two kinds of feelings，and sometimes one causes the other，but they are not the same．Pleasure is a more dependent on the five senses while happiness is independent of them．   
When you are happy，little unpleasant events usuallv do not disturb you．When you are unhappy，you feel as if everything is against you．You may compensate for it by eating chocolate and sweets because this gives you pleasure，yet you stay unhappy．A person may smoke cigarettes because it gives him pleasure，yet this does not make him happier，especiallv if he knows the fact that it is not good for his heahh．   
The physical world is always in a changing state．At each moment a new thing is being created，changed，transformed and then destroyed．This is the normal state of things and no one  can change it．If we stay still in a certain state，we are sure to experience unhappiness sooner or later．0n the other hand, if
we adjust to the environment，nothing can influence our moods．Then outer events have nothing to do with our inner joy of mind．  
The room of the mind is filled with worry or fear．If you are free of thinking about them，the room has been emptied，and  then you will see what is happening and experience it．When your mind stays quiet，you will see that happiness comes from the inside．   
小題1:What does the underlined phrase”compensate for“in Paragraph 2 most probably mean?  
A．to make a suitable payment for
B．to let out your anger for
C．to provide with a balancing effect for
D．to solve the problems for
小題2:According to the passage，in which of the following situations can you feel happy?  
A．A friend gives you a glass of cold lemonade when you feel thirsty．
B．You eat chocolate and sweets when you feel as if everything is against you．
C．Smoke cigarettes even though you know the fact that it is not good for your health．
D．You are free from worry or fear when your mind stays quiet．
小題3:We call learn from the passage   
A．happiness is more dependent on the five senses
B．pleasure sometimes arouses happiness
C．you feel happy when nothing around you changes in a certain state
D．you feel unhappy because you have to adjust to the environment
小題4:Which can be the best title for the passage?    ]
A．Pleasure Leads to Happiness
B．Happiness Changes Us
C．Happiness Is Within Us
D．Stay a Quiet Mind

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

Temperature is measured by means of a thermometer (溫度計). One general form of thermometer depends upon the fact that most solids and liquids expand as their temperature rises. There are one or two exceptions. There is, for instance, a kind of steel called invar (from “invariable”) which does not change its dimensions as temperature changes; it is valuable for making pendulums (鐘擺), since, if the length of a pendulum changes, its time of vibration changes. It is also used for making very accurate measuring scales. In both cases, then, changes of atmospheric temperature have no effect if invar is used.
Another exception is that very odd liquid, water, which has many strange properties (特性). As water gets colder it contracts (收縮), which is ordinary behavior, until it reaches the temperature of 30℃. above freezing point. After that, as it gets colder, it expands. This is fortunate---for considering the freezing of a pond. As the water on top gets colder, it shrinks; and so, volume for volume, it becomes heavier and sinks. This goes on until all the pond is at 30℃, but after that, as the water becomes colder it expands. Therefore the colder water stays on top and freezes, covering the pond with ice. If the water went on contracting down to the freezing point, the pond would become a solid block of ice in the end. This would not worry people who live in hot climates, but it would be very serious for those who live in cold climates, especially for those who want to break the ice and catch fish which live in the cold water beneath.
小題1: Invar is valuable for making pendulums because _______.
A．it can hardly change its shape or size as temperature changes.
B．it will change its dimensions without the change of temperature.
C．its time of vibration doesn’t change if its length changes.
D．its time of vibration does not change if its length changes.
小題2: As water gets colder after reaching the temperature of 30℃. it will _______.
A．contractB．shrinkC．expandD．freeze
小題3: Which of the following statements is true, according to this passage?
A．Only invar can be used to make a thermometer.
B．Only water can be used to make a thermometer.
C．Both invar and water can be used to make a thermometer.
D．Neither invar nor water can be used to make a thermometer.
小題4:The best title of this passage is most likely to be  _____.
A．Temperature MeasurementB．Two Exceptions
C．Uses of Invar D．Properties of Water

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

Hey there,
So you're about to spend four years of your life and tens of thousands of dollars of your parents' money, and all you really know about college is that all of your friends are going. Do you ever consider why you're going? 
Relax. You're making the right decision. First of all, you'll discover what interests you by taking courses in many subjects. It's hard to decide whether you want to be a painter if you've never painted any pictures, until you're in a drawing-room on campus. College is also a lot of fun — after you graduate, you'll be working every weekday for 50 or so years. And remember that college graduate earn about twice the income of those who never attended college. 
Finding the right college can be difficult. Fortunately, Johnson Review is here to help you every step of the way. 
*Researching Schools. The most important decision you'll make is to choose the school that really suits your best — not the one that is the most competitive or has the best-equipped rooms. 
*Applying to School. On JohnsonReview.com, you’ll find hundreds of actual college applications and links to many more. 
*Raising Your Scores. American College Test is one of the most difficult parts of the admission(錄取) course. It's not the most important, though, and not everyone needs to prepare for the test. But, if you can do better, find the right course for better scores. 
*Paying for School. Most families need financial aid for the high cost of college. The problem is that financial aid seems difficult to get and many families get caught up in the price of college instead of learning the ways to get financial aid. If you really do your research, you'll learn that you can afford to attend any college, no matter the cost. 
For more information, call 600-3681 or visit JohnsonReview.com. Wherever you go, have a nice trip! 
Johnson Smith 
Founder and CEO 
Johnson Review 
小題1:How many reasons for going to college does the author mention in the text? 
A．5B．4 C．3D．2
小題2:The author thinks you should choose the college that is _______________. 
A．famousB．suitableC．competitiveD．well-equipped
小題3: What does the author advise you to do to pay the high cost college? 
A．To study the financial courses.
B．To ask the society for donation.
C．To get to know how to ask for financial aid.
D．To do research on the financial system of college
小題4: What's the author's purpose of writing this test?
A．To make Johnson Review popular.
B．To help readers find the right college.
C．To suggest ways to prepare for college learning.
D．To introduce college life to high school students.

查看答案和解析>>

同步練習冊答案