Many gardeners believe that “talking” to their plants helps them grow---it turns out that they may not be crazy after all. According to the scientists from the University of Exeter, plants may keep communicating with each other through a secret “unseen” language.

For their experiment, the scientists picked a cabbage plant that is known to send out a gas when its surface is cut. In order to get video evidence of the communication, they changed the cabbage gene by adding the protein---luciderase(蟲熒光素酶), which is what makes fireflies(螢火蟲) glow in the dark.

When the changed cabbage plant was in full bloom, they cut a leaf off with a pair of scissors, and almost immediately, thanks to the luciderase, they could see the plant sending out “methyl jasmonate(茉莉酸甲酯)”.

While this was a known fact, what was surprising was the fact that the minute this gas began to give out, the nearby cabbage plants seemed to sense some kind of danger and started to send out a gas that they normally have to keep predators(捕食者) like caterpillars(毛蟲) away.

What the scientists are not sure is whether the plants are trying to warn the other leaves or the near plants about the danger---something that will require further research However, the team, which is led by Professor Nick Smirnoff, is quite excited about the findings because this is the first time it has been proved that plants do not live a passive life, but actually move, sense and even communicate with each other.

However, before you get all concerned, they are quite sure that plants do not feel the pain when they are cut, since they do not have nerves---so go ahead and bite into that juicy carrot!

1.What’s the best title of the passage?

A. Plants Can Send Some Gas

B. Plants Can Communicate with Each Other

C. The “Unseen” Language of Plants

D. Plants Can’t Feel Pain

2.What does the underlined word “they” in Paragraph 1 mean?

A. Gardeners B. Plants

C. Scientists D. Fireflies

3.When the plant sent out methyl jasmonate, which of the following statements is NOT TRUE?

A. The nearby cabbage plants seemed to sense some kind of danger.

B. The nearby cabbage plants started to send out a gas.

C. The nearby cabbage plants tried to warn the near plants.

D. The nearby cabbage plants communicated through a secret language.

4.According to the experiment, plants ________________.

A. don’t live a passive life

B. can feel pain when they are cut

C. can warn the other leaves about danger

D. can talk with each other

練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源：2016屆安徽蚌埠市高三12月月考英語試卷（解析版） 題型：閱讀理解

With the development of the Internet, it has resulted in a huge increase in credit-card fraud. Your card information could even be for sale in an illegal web site.

Web sites offering cheap goods and services should be regarded with care.

On-line shoppers who enter their credit-card information may never receive the goods they thought they bought. The thieves then go shopping with your card number — or sell the information over the Internet. Computers hackers have broken down security systems, raising questions about the safety of cardholder information. Several months ago, 25, 000 customers of CD Universe , an on-line music retailer(零售商), were not lucky. Their names, addresses and credit-card numbers were posted on a Web site after the retailer refused to pay US $157, 828 to get back the information.

Credit-card firms are now fighting against on-line fraud. MasterCard is working on plans for Web — only credit card, with a lower credit limit. The card could be used only for shopping on-line. However, there are a few simple steps you can take to keep from being cheated.

Ask about your credit-card firm’s on-line rules: Under British law, cardholders have to pay the first US $78 of any fraudulent(欺騙性的) spending.

And shop only at secure sites; Send your credit-card information only if the Web site offers advanced secure system.

If the security is in place, a letter will appear in the bottom right-hand corner of your screen. The Website address may also start https: //—the extra “s” stands for secure. If in doubt, you’re your credit-card information over the telephone.

Keep your password safe: Most on-line sites require a user name and password before placing an order. Treat your passwords with care.

1.What is the meaning of “fraud”?

A. Safety. B. Sale. C. Payment. D. Cheating.

2.What do most people worry about the Internet according to this passage?

A. Fraud on the Internet.

B. Many Web sites are destroyed.

C. Many illegal Web sites are on the Internet.

D. A lot of stolen credit-cards were sold on the Internet.

3.How can the thieves get the information of the credit card?

A. The customers give them the information.

B. The thieves steal the information from Web sites.

C. The customers sell the information to them.

D. The thieves buy the information from credit-card firms.

4.You are shopping on the site: http: // www. Shopping. com, and you want to buy a TV set, what does this article suggest you do?

A. Order the TV set at once.

B. Do not buy the TV set on this site.

C. E-mail the site your credit-card information.

D. Tell the site your password and buy the TV set for you.

5.How many pieces of advice does the passage give to you?

A. six. B. three. C. Five. D. four.

查看答案和解析>>

科目：高中英語 來源：2014-2015學(xué)年江蘇如皋中學(xué)高二上學(xué)期10月階段練習(xí)英語試卷（解析版） 題型：閱讀理解

I lost my sight when I was four years old by falling off a box car in a freight yard in Atlantic City and landing on my head. Now I am thirty two. I can vaguely remember the brightness of sunshine and what color red is. It would be wonderful to see again, but a calamity can do strange things to people. It occurred to me the other day that I might not have come to love life as I do if I hadn't been blind. I believe in life now. I am not so sure that I would have believed in it so deeply, otherwise. I don't mean that I would prefer to go without my eyes. I simply mean that the loss of them made me appreciate the more what I had left.

Life, I believe, asks a continuous series of adjustments to reality. The more readily a person is able to make these adjustments, the more meaningful his own private world becomes. The adjustment is never easy. I was bewildered and afraid. But I was lucky. My parents and my teachers saw something in me--a potential to live, you might call it--which I didn't see, and they made me want to fight it out with blindness.

The hardest lesson I had to learn was to believe in myself. That was basic. If I hadn't been able to do that, I would have collapsed and become a chair rocker on the front porch for the rest of my life. When I say belief in myself I am not talking about simply the kind of self confidence that helps me down an unfamiliar staircase alone. That is part of it. But I mean something bigger than that: an assurance that I am, despite imperfections, a real, positive person; that somewhere in the sweeping, intricate pattern of people there is a special place where I can make myself fit.

It took me years to discover and strengthen this assurance. It had to start with the most elementary things. Once a man gave me an indoor baseball. I thought he was mocking me and I was hurt. "I can't use this." I said. "Take it with you," he urged me, "and roll it around." The words stuck in my head. "Roll it around! "By rolling the ball I could hear where it went. This gave me an idea how to achieve a goal I had thought impossible: playing baseball. At Philadelphia's Overbrook School for the Blind I invented a successful variation of baseball. We called it ground ball.

All my life I have set ahead of me a series of goals and then tried to reach them, one at a time. I had to learn my limitations. It was no good to try for something I knew at the start was wildly out of reach because that only invited the bitterness of failure. I would fail sometimes anyway but on the average I made progress.

1.We can learn from the beginning of the passage that __________________.

A. the author lost his sight because of a car crash.

B. the disaster strengthened the author's desire to see

C. the disaster made the author appreciate what he had.

D. the author wouldn't love life if the disaster didn't happen.

2.What's the most difficult thing for the author?

A. Building up assurance that he can find his place in life.

B. To find a special work that suits the author.

C. Learning to manage his life alone.

D. How to adjust himself to reality.

3.According to the context, "a chair rocker on the front porch" in paragraph 3 means that the author

A. was paralyzed and stayed in a rocking chair.

B. would sit in a rocking chair and enjoy his life.

C. would sit in a chair and stay at home.

D. would lose his will to struggle against difficulties.

4.According to the passage, the baseball and encouragement offered by the man

A. inspired the author.

B. hurt the author's feeling.

C. gave the author a deep impression

D. directly led to the invention of ground ball.

5. According to the passage, which of the following is CORRECT?

A. The author set goals for himself but only invited failure most of the time.

B. The author suggested not trying something beyond one's ability at the beginning.

C. Because of his limitations, the author tried to reach one goal at a time.

D. The bitterness of failure prevented the author from trying something out of reach.

查看答案和解析>>

科目：高中英語 來源：2014-2015學(xué)年河北承德第八中學(xué)高二上第二次月考英語試卷（解析版） 題型：語法填空

根據(jù)上下文的語法結(jié)構(gòu)及所給提示填空，使短文連貫通順。

People __1.__ (live) in different countries made different kinds of words. Today there are about fifteen hundred __2._(language) in the world. Each contains many thousands of words. A very large dictionary, for example, contains four _3.__five hundred thousand words. But we do not need _4._ these. To read short stories you need to know only about two thousand words. __5.__ you leave school, you will learn only one thousand or more. The words you know are called your vocabulary. You should try to make your vocabulary __6.__ (big). Read as many books as we can. There are a lot of books _7.__ (write) in easy English. You will enjoy them. When you meet __8.__ new word, look it __9.__ in your dictionary. Your dictionary is your __10. (much) useful book.

查看答案和解析>>

科目：高中英語 來源：2016屆河南省開封市高三上學(xué)期第一次模擬考試英語試卷（解析版） 題型：語法填空

閱讀下面材料，在空白處填入適當(dāng)?shù)膬?nèi)容（1個單詞）或括號內(nèi)單詞的正確形式。

將答案填寫在答題卡的相應(yīng)位置。

According to Zheng Jun, Qinqiang opera is similar 1. rock’ n ’roll in many ways, and the latter is therefore the modern day Qinqiang. Rock concerts, 2. star the common people, take place by the city wall on a daily basis.

Qinqiang opera 3. (call) the “l(fā)iving fossil” of Chinese opera, the forefather of several operas in China. 4. (Spread) to Henan, it developed into Yu opera. Judging even by today’s standards, Qinqiang opera counts as the 5. (early) Chinese rock music. The spirit of modern rock’ n ’roll 6. (seem) to come from it.

The number of Qinqiang opera amateur 7. (club) in Xi’an is uncertain. At places like the City Wall Park and the South gate, you can spot groups of people enjoying the opera. Known or unknown to the group, any Qinqiang lover is welcome to sing a piece 8. just sit down and listen. The singer presents excellent voice and emotions while the audiences get 9. (excite) by the tunes. Standing among 10. (they), you could feel the cultural pulse of this city.

查看答案和解析>>

科目：高中英語 來源：2016屆吉林省高三上學(xué)期期中考試英語試卷（解析版） 題型：閱讀理解

Once there was a poor farmer and his farm belonged to(屬于) a rich man． One day he brought a basket of apples to the rich man’s house． On the doorsteps, he met two monkeys dressed like children． They jumped onto the basket to eat the apples and threw some on the grounD． The farmer politely took off his hat and asked the monkeys to get off． They obeyed(服從) and the farmer went into the house． He asked to see the rich man． A servant took him to the room where the rich man was sitting．

"I have brought you the basket of apples you asked for," he saiD．

"But why have you brought a half-empty basket?" the rich man askeD．

"I met your children outside, and they stole(偷) some of the apples．"

1.Why did the farmer bring apples to the rich man? Because

A． he was poor

B． he liked the rich man

C． his farm belonged to the rich man

D． the rich man’s children liked apples

2.What did the monkeys do when the farmer was on the doorsteps?

A． They jumped and jumpe

B． They playeD．

C． They ran away．

D． They ate some of the apples．

3.The monkeys left the basket because

A． they had thrown apples on the ground

B． the farmer had politely asked them to get off

C． they were afraid of the hat

D． the farmer wa s angry wit h them

4.How did the rich man feel when he saw the basket? He felt 。

A． pleased

B． unhappy

C． excited

D． moved

查看答案和解析>>

科目：高中英語 來源：2016屆河南省洛陽市高三上學(xué)期期中聯(lián)考英語試卷（解析版） 題型：閱讀理解

The Brown Bear

My wife Laura and I were on the beach，with three of our children，taking pictures of shore birds near our home in Alaska when we spotted a bear. The bear was thin and small，moving aimlessly.

Just a few minutes later，I heard my daughter shouting，“Dad！The bear is right behind us！” An aggressive bear will usually rush forward to frighten away its enemy but would suddenly stop at the last minute. This one was silent and its ears pinned back—the sign(跡象) of an animal that is going in for the kill. And it was a cold April day. The bear behaved abnormally，probably because of hunger.

I held my camera tripod(三腳架) in both hands to form a barrier as the bear rushed into me. Its huge head was level with my chest and shoulders，and the tripod stuck across its mouth. It bit down and I found myself supporting its weight. I knew I would not be able to hold it for long.

Even so，this was a fight I had to win：I was all that stood between the bear and my family，who would stand little chance of running faster than a brown bear.

The bear hit at the camera，cutting it off the tripod. I raised my left arm to protect my face；the beast held tightly on the tripod and pressed it into my side. My arm could not move，and I sensed that my bones were going to break.

Drawing back my free hand，I struck the bear as hard as I could for five or six times. The bear opened its mouth and I grasped its fur，trying to push it away. I was actually wrestling(扭打) with the bear at this point. Then，as suddenly as it had begun，the fight ended. The bear moved back towards the forest，before returning for another attack—the first time I felt panic.

Apparently satisfied that we caused no further threat，the bear moved off，destroying a fence as it went. My arm was injured，but the outcome for us could hardly have been better. I’m proud that my family remained clear?headed when panic could have led to a very different outcome.

1.The brown bear approached the family in order to .

A． catch shore birds

B． start an attack

C． protect the children

D． set up a barrier for itself

2.The bear finally went away after it .

A． felt safe

B． got injured

C． found some food

D． took away the camera

3.The writer and his family survived mainly due to their .

A． pride

B． patience

C． calmness

D． cautiousness

查看答案和解析>>

科目：高中英語 來源：2016屆江蘇揚(yáng)州中學(xué)高三上學(xué)期12月月考英語試卷（解析版） 題型：其他題

請認(rèn)真閱讀下列短文，并根據(jù)所讀內(nèi)容在文章后表格中的空格里填入一個最恰當(dāng)?shù)膯卧~。

注意：每個空格只填1個單詞。請將答案寫在答題卡上相應(yīng)題號的橫線上。

Socrates-an ancient Greek philosopher

Socrates was an ancient Greek philosopher, who helped to shape Greek beliefs. The ideas he created are present in our culture today.

Socrates was a person full of curiosity. From the time he was a young man, Socrates searched for wisdom and truth. He gained wisdom by asking questions. Many people in Athens thought that they had answers. Socrates asked them questions and argued with them about different topics. He did not think they had the knowledge they claimed to have.

Socrates challenged false ideas people had about things like justice, love, or courage. He would break down the ideas people held．Then he built new and more accurate ideas. Socrates felt that this was what philosophy was all about. Since then, many great philosophers have used this method to find truth．

Throughout his life, Socrates showed no interest in money. He was also not interested in material items. Socrates would allow groups of men to listen to him speak. And he would never take money from them. He always wore the same clothes whatever the season. Socrates argued that his life was better because he had no material wealth. He felt he enjoyed his food more. he said he was stronger and healthier because he was not affected by the weather. He believed happiness came not from having more but from wanting less.

By the end of the fifth century B.C Athens was not a great city anymore. Politicians betrayed Athens. Socrates had made many people angry over the years. He had always expressed his opinions when he thought laws and policies were wrong. Athens had a new group of political leaders in power, who didn't want to hear Socrates‟comments” about them. They thought Socrates had a bad influence on the young people of Athens. Socrates was also accused of not worshipping the right gods. Charges were brought against Socrates．The politicians wanted to condemn Socrates to death. Socrates’ friends told him to leave Athens. They thought this was the only way for him to save his life. Socrates refused. He did not behave as most people in his situation would．

Socrates said that he had always lived by the rules of Athens and he would continue to do this.He insisted on standing trial for his "crime". Socrates knew he was not guilty of anything. The reason why he was charged was because he was different from others. Although people respected him, he also had made many people angry, so the jury（陪審團(tuán)）said Socrates was guilty.

When faced with the death penalty, a person could leave Athens forever. Most people chose leave rather than die. Socrates was not like most people. Instead of telling the jury that he would go, he told them he deserved a reward. Socrates believed he had done a great service by making people think. Socrates said that he tried to "persuade every one of you not to think of what he had but rather of what he was, and how he might grow wise and good." The jury did not change its mind. Socrates was executed. He died when he drank hemlock, which is poisonous.

Socrates was the first great Greek philosopher. He also helped to shape other philosophers that came after him. Plato, who got his start by studying with Socrates, and Aristotle, who studied with Plato, also changed Western civilization. Asking questions to discover the truth is still practiced today. And schools even today still teach this method to students.

Socrates-an ancient Greek philosopher

Brief introduction

Socrates, an ancient Greek philosopher whose ideas still 1._______ in our culture today.

Unique personalities

a 2._____ person who gained wisdom by asking question.

a simple person who3.______ spiritual health to material wealth.

a courage person who presented a 4.______ to false ideas.

a thoughtful person whose new and accurate ideas 5. _______ other philosophers to seek truth.

Unfair accusations

He always 6._____ on laws and policies.

He didn’t show 7.______ for the right gods.

Glorious death

8.______ form others, he chose to die rather than leave.

Faced with death, he was committed to 9._______ people into thinking deeply.

Great 10.___

Socrates was pioneer of Greek Philosophy.

Asking questions to discover the truth is still practiced today.

查看答案和解析>>

科目：高中英語 來源：2014-2015學(xué)年山東省高三第一次診斷性考試英語試卷（解析版） 題型：閱讀理解

No one knows exactly how many disabled people there are in the world，but estimates suggest the figure is over 450 million．The number of disabled people in India alone is probably more than double the total population of Canada．

In the United Kingdom，about one in ten people have some disability．Disability is not just something that happens to other people：as we get older，many of us will become less mobile，hard of hearing or have failing eyesight．

Disablement can take many forms and occur at any time of life．Some people are born with disabilities．Many others become disabled as they get older．There are many progressive（逐漸的）disabling diseases．The longer time goes on，the worse they become．Some people are disabled in accidents．Many others may have a period of disability in the form of a mental illness．All are affected by people’s attitude towards them．

Disabled people face many physical barriers．Next time you go shopping or to work or visit friends，imagine how you would manage if you could not get up steps，or onto buses and trains．How would you cope if you could not see where you were going or could not hear the traffic?But there are other barriers：prejudice（偏見）can be even harder to break down and ignorance represents the greatest barrier of a11．It is almost impossible for the able-bodied to fully appreciate what the severely disabled go through，so it is important to draw attention to these barriers and show that it is the individual person and their ability，not their disability，that counts．

1.The first paragraph mainly points out that ______________．

A． there are many disabled people in the world

B． the number of disabled people in India is the greatest

C． India has much more disabled people than Canada

D． it is impossible to get an exact figure of the world’s disabled people

2.The key word in paragraph 4 is _______________．

A． disability B． ignorance

C． prejudice D． barriers

3.The last word of the text“counts”most probably means ____________．

A． is most important

B． is considered

C． is included

D． is numbered

4.Which of the following statements is NOT true? ________________．

A． even the able-bodied may become disabled in some way

B． the disabled prefer to be ignored by the able-bodied

C． prejudice against the disabled should be removed

D． The disabled make up about 10 percent in the UK’s population

5.it can be concluded from the passage that ______________．

A． we should try our best to prevent disablement

B． physical and metal barriers are equally hard to break down

C． we should take a proper attitude towards the disabled

D． all of us will be disabled at a certain time of our life

查看答案和解析>>

同步練習(xí)冊答案