For the first time, researchers have discovered that some plants can kill insects in order to get additional nutrients. New research shows that they catch and kill small insects with their own sticky hairs near the roots and then absorb nutrients through their roots when the insects are killed and fall to the ground.

Professor Mark Chase, of Kew and Queen Mary, University of London, said: “The cultivated (改良的) tomatoes and potatoes still have the hairs. Tomatoes in particular are covered with these sticky hairs. They do trap small insects on a regular basis. They do kill insects.”

The number of these carnivorous plants is thought to have came up to 50 percent and many of them have until now been wrongly regarded as among the most harmless plants. Among them are species of petunia（矮牽牛）, some special tobacco plants and cabbages, some varieties of potatoes and tomatoes, etc. Researchers at Royal Botanical Gardens Kew, which carried out the study, now believe there are hundreds more killer plants than previously realized.

It is thought that the technique was developed in the wild to get necessary nutrients in poor quality soil – and even various plants grown in your vegetable garden still have the ability.

The researchers, publishing their finding in the Botanical Journal of the Linnean Society, said: “We may be surrounded by many more murderous plants than we think.” “We are accustomed to thinking of plants as being immobile and harmless, and there is something deeply frightening about the thought of meat-eating plants," they added.

1.Tomatoes and potatoes kill insects to _____.

A. get more sticky hairs

B. make themselves grow better

C. make their roots stronger

D. avoid falling down to the ground

2.The word “carnivorous” in Paragraph 3 most probably means _____.

A. fast-growing

B. harmless

C. insect-killing

D. nutritious

3.The insect-killing technique of vegetables is developed most probably through _____.

A. evolution of species

B. helps from other garden plants

C. artificial cultivation

D. nutrients preserved in rich soil

4.The text is probably taken from _____.

A. a student book

B. a science fiction

C. a scientific repot

D. a bulletin board

練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源：2014-2015學(xué)年北京市海淀區(qū)高三一模英語試卷（解析版） 題型：其他題

根據(jù)短文內(nèi)容，從短文后的七個選項中選出能填入空白處的最佳選項。選項中有兩項為多余選項。

House Sitting

In many countries of the world people do what is called house sitting．It means that if owners of the house are going away, they want someone to come into their home and look after the house and maybe pets while they are away．

In Australia, many people travel．After people retire, they might buy a van and travel all over the country．1.

So if someone wants to travel or go away for some reason, they might want someone in their home to care for it and keep the gardens tidy．House sitters might have to care for pets．Also, quite a few people have swimming pools in their back yard and they need cleaning．2. I feel it is a great way of seeing the country, because you go and stay in a new city, get to meet new people, and have time to go sightseeing in a new area．

3. There are websites where you find the advertisements by people who want to travel, and by replying to the advertisement, you can make arrangements to go and look after their home.

There are some requirements to be a house sitter．You must be a trusted person, so that the home owner knows you will not steal anything．You must be able to go when the house owner wants you to go, so you need lots of free time．4.You need to be good with pets, able to care for cats and dogs, or other pets they may have.

Some house sitting jobs are just for a few days or a couple of weeks while the house owner have a short holiday．Sometimes it is for much longer．We have had one house sit for six months, while the home owner travelled to Europe.

5. Then you can travel to many different countries and stay there．One of the important things to get are references from the home owners where you have stayed．A reference is a written letter to say that you are trustworthy and have looked after their home well．You can show these letters to prospective house sitting jobs and they know you will do a good job.

A．I have done house sitting many times.

B．Thousands of people do this all the time.

C．It is also possible to do house sitting in other countries.

D．Generally you have many opportunities to get a house sitting job.

E．You must take a little care over what your description says about you.

F．This is an international house sitting service for all city and country areas.

G．You must have a good car, so you can travel to different parts of the country.

查看答案和解析>>

科目：高中英語 來源：2014-2015學(xué)年江蘇省南京市鹽城市兩校高三第二次模擬考試英語試卷（解析版） 題型：單項填空

—Do you think he is the only person for the job?

—I’m not quite sure but he’ll prove_______ to the task.

A. equal B. essential

C. special D. superior

查看答案和解析>>

科目：高中英語 來源：2014-2015學(xué)年安徽省江淮名校高三第二次聯(lián)考英語試卷（解析版） 題型：單項填空

—What bad luck! I had a cut in salary yesterday．

—____．I warned you not to be late again and again but you ignored it．

A．You asked for it

B．Never mind

C．Take it easy

D．By all means

查看答案和解析>>

科目：高中英語 來源：2013-2014學(xué)年陜西省高三第七次適應(yīng)性訓(xùn)練英語試卷（解析版） 題型：閱讀理解

To Friend or Not To Friend

We all love our parents and turn to them when we’re in need, but would you like them to hear the conversations you have with your friends on the school playground or lunch queue? Social networking sites have become extensions of the school hallways, so would you add your parents as “friends” and allow them to view your online activities and conversations with friends?

In the past the generation gap included a technology gap, where children were up to date with latest technology and parents were left behind, content to continue their day to day lives as they always had because they had no need to know more about technology. However, more and more parents are beginning to realize just how important social networks are in their lives. This realization has given many parents the motivation to education themselves about social networking sites.

These days many people are attracted to social networking sites because they can choose who they have around them; there’s also a certain amount of control over privacy that we don’t get in real life. Sometimes we feel that privacy is violated when we must accept a “friend” request from a parent or family member.

It’s a difficult choice whether or not to allow a parent to become a part of our online lives. On the one hand we don’t want to “reject” their request because that might hurt their feelings or make them feel you have something to hide. On the other hand if you do accept, then you could have a sense of being watched and no longer feel free to comment or communicate the way you did before.

A recent survey suggested that parents shouldn’t take it personally if their child ignores their request, “When a teen ignores a parent’s friend request, it doesn’t necessarily mean that they are hiding something, but it could mean that this is one part of their life where they want to be independent.”

Perhaps talking with parents and giving explanations would help soften the blow if you do choose not to add them to your friends list.

1.From Paragraph 2, we learn that _______.

A. parents feel secure about their privacy online

B. social networks successfully fill the generation gap

C. parents have realized the importance of social networks

D. social networks offer a platform for parents to communicate

2.Teenagers may refuse a parent’s friend request because _______.

A. they hide something from their parents

B. they are unwilling to be watched by parents

C. their parents tend to fall behind in technology

D. their parents make negative comments on them

3.The passage is mainly about _______.

A. privacy online

B. social networks

C. the generation gap

D. parents’ friend requests

4.The passage is written mainly for _______.

A. parents B. teenagers

C. teachers D. researchers

查看答案和解析>>

科目：高中英語 來源：2013-2014學(xué)年安徽合肥市高三第一次質(zhì)量檢測英語試卷（解析版） 題型：單項填空

Come on! Anybody here can learn to do a rock climb. There is _____ to it really.

A. everything B. anything

C. nothing D. something

查看答案和解析>>

科目：高中英語 來源：2014-2015學(xué)年重慶市高三上學(xué)期第二次月考英語試卷（解析版） 題型：閱讀理解

E

Manners nowadays in big cities like London are particularly non-existent. It’s nothing for a big, strong schoolboy to elbow an elderly woman aside in the dash for the last remaining seat on the tube or bus, much less stand up and offer his seat to her.

This question of giving up seats in public transport is much argued by young men, who say that, since women have claimed equality, they no longer deserve to be treated with courtesy(謙恭有禮) and that those who go out to work should take their turn in the rat race like anyone else. Women have never claimed to be physically as strong as men. Even if it’s not agreed, however, that young men should stand up for older women, the fact remains that courtesy should be shown to the old, the sick and the burdened. Are we really so lost to all ideals of unselfishness that we can sit there indifferently reading the paper or a book, saying to ourselves “ First come, first served”, while a gray-haired woman, a mother with a young child or a cripple stands? Yet this is too often seen.

Older people, tired and easy annoyed from a day’s work, aren’t angels, either—far from it. Many a brisk argument or an insulting quarrel breaks out as the weary queues push and shove each other to get on buses and tubes. One cannot commend(推崇) this, of course, but one does feel there is just a little more excuse.

If cities are to remain pleasant places to live in at all, however, it seems necessary, not only that communication in transport should be improved, but also that communication between human beings should be kept smooth and polite. Shop assistant won’t bother to assist, taxi drivers growl at each other as they dash dangerously round corners, bus conductors pull the bell before their desperate passengers have had time to get on or off the bus, and so on. It seems to us that it’s up to the young and strong to do their small part to stop such deterioration (惡化).

1.What is the writer’s opinion concerning courteous manners towards women?

A. They no longer need to be treated differently from men.

B. Young men should give up their seats to young women.

C. “Lady first” should universally practiced.

D. Special consideration ought to be shown to them in some cases.

2.What does “ the rat race” in paragraph 2 probably mean in the passage?

A. A race that involves many people

B. A well-paid job

C. A fierce competition

D. A race for rats

3.According to the passage, communication between human beings would not be smoother unless ____.

A. people become more considerate towards each other

B. people are not so tired and easily annoyed

C. women are treated with more courtesy

D. public transport is improved

4.The main purpose of the passage is to ______.

A. call on people in big cities to pay more attention to politeness

B. blame the schoolboy’s rude behavior towards elderly women on tube or bus

C. criticize the fast pace of life in most of the big cities

D. tell young men to give their seats to elderly people and women

查看答案和解析>>

科目：高中英語 來源：2014-2015學(xué)年重慶市高三9月月考英語試卷（解析版） 題型：單項填空

Nearly a century later，extensive observations that elephants indeed remember injuries and hold hates against their abusers．

A．confirmed B．have confirmed

C．will confirm D．had confirmed

查看答案和解析>>

科目：高中英語 來源：2015-2016學(xué)年湖南兩校高二上學(xué)期期中聯(lián)考英語試卷（解析版） 題型：閱讀理解

Many people write to newspaper and magazines to express their opinions. Letters to the editor must carry the writer’s full name, address and telephone number, although the information is not necessary for publication. This requirement to provide personal particulars is a clear indication that writers are held responsible for what they say. When a writer wants his voice heard, he needs to claim ownership of his voice. Responsibility is the name of the game.

“People today prefer living together to putting their signatures on a marriage certificate because they refuse to accept responsibility for the relationship,” said social worker Ken Yip, “and this is what is causing a lot of family problems.” When we sign a paper, for example, a business contract or a bank document, the signature is a seal of consent, an agreement to take the matter seriously. Most governments and many organizations will not process written complaints if they do not bear the writer’s signature. The absence of a signature, they explain, tells us that the writer cannot be too serious and therefore does not deserve a reply.

There are people who wish to remain anonymous(匿名的) for various reasons. Multi-billionaire Mr. King donates generously to charity several times a year. He gives simply because he wants to help but not for the publicity his donations may bring, and he does not want his good deeds to make news. In other cases, people insist on anonymity because they are afraid of the consequences of revealing their identity. Crime witnesses may be willing to assist the police, but most are unwilling to give their names when reporting a crime.

Name or no name? The answer is very personal and lies in how much we want to get involved. We all have a name. It is a matter of responsibility to use it when we make a statement, a claim or an accusation. We all want to honor our own name, and it is only by stamping our expression of an opinion with our own name that we honor what we say.

1.What does the writer mean by saying “Responsibility is the name of the game”?

A. Writers need to provide their personal information in the game.

B. Publication must bear the writer’s full name, address and phone number.

C. Writers should be responsible for their names.

D. Names are required to indicate writers’ responsibility for what they say.

2.The second paragraph suggests that a paper without a signature may _______.

A. not get a reply

B. help to end a relationship

C. be accepted all the same

D. become a family problem

3.Some people don’t want their names known because they are ________.

A. hesitant to make a donation

B. unwilling to draw public attention

C. afraid of an accusation

D. ready for involvement

4.The passage is mainly about _______.

A. honor and writers

B. identity and signature

C. signature and responsibility

D. anonymity and signature

查看答案和解析>>

同步練習(xí)冊答案