-Catherine, I have cleaned the room for you.-Thanks. You it, I could manage it myself.A. needn’t do B. needn’t have doneC. mustn’t do D. shouldn’t have done 题目和参考答案——青夏教育精英家教网—

题目内容

—Catherine, I have cleaned the room for you.

—Thanks. You____ it, I could manage it myself.

A. needn’t do B. needn’t have done

C. mustn’t do D. shouldn’t have done

【解析】

试题分析：考查情态动词。句意：--凯瑟琳，我已经帮你打扫房间了。--谢谢，你本来没有必要这样做的，我可以自己打扫的。A. needn’t do现在或将来不需要做 B. needn’t have done以前本来不需要做C. mustn’t do 禁止做某事 D. shouldn’t have done本来不应该做而做了，根据句意故B正确。

考点：考查情态动词

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Talking plants might sound like characters in a fairy tale. But recent scientific studies have shown that plants communicate with each other and with other living things in a surprising number of ways. To understand them, scientists say, we just have to learn their language. Farmers are especially interested in what plants have to say.

“Plants are able to communicate with all sorts of organisms (有机体). They can communicate with giant bacteria, with other plants and with insects. They do this chemically，” said Cahill, an Ecology Professor of the University of Alberta in Canada.

Plant scientists are just beginning to understand this chemical “language”. Cahill says studies have shown, for example, that plants can evaluate (评估) conditions in their immediate environment and take appropriate actions. Plants have an ability, for example, to signal pain or discomfort caused by anything from temperature extremes to an insect attack. Jack Schultz, a professor of chemical ecology at the University of Missouri, says when a plant senses that it's being eaten, it cannot walk away from trouble; on the contrary, it will release a chemical vapor(蒸汽) that alerts other plants nearby.

“Their language is a chemical language, and it involves chemicals that move through the air that are easy to be changeable, and most of all are smells that we are familiar with，” Schultz explained.

“All plants responded to the attack by changing their chemistry to defend themselves，” Schultz recalled. “But we were quite surprised to find that nearby plants also changed their chemistry to defend themselves, even though they were not part of the experiment.”

Studies have also shown that plants under attack release pleasant chemicals. Those chemicals attract friendly insects that attack the pests eating the plant.

In the end, plants' ability to communicate their needs—and our ability to understand them—could help farmers reduce the use of poisonous chemicals, cut operating costs and limit damage to the environment.

1.The recent scientific studies have shown that plants can ______.

A．communicate with other living things in a chemical way

B．hardly react to any sudden change in temperature

C．use a very special chemica1 language which is familiar to us

D．respond to the attack by giving off poisonous chemicals

2.When being eaten by an insect, the plant will ________.

A．walk away from trouble

B．change its chemistry to kill the insect

C．release a chemical vapor to “ask” other plants for help

D．give off nice chemicals to attract friendly insects killing the pest

3.The underlined word “alert” most probably means “______”．

A．warn B．protect

C．threaten D．allow

4.Which would be the best title for the passage?

A．Communication between Plants

B．A Chemical “Language”

C．Plants Can Talk

D．How Plants Protect Themselves

I remember my math teacher Mr. Young very well. He stood out because the kids made fun of him. He was missing one of his fingers, and always pointed at students with his middle finger.

I was not very good at English and math. No matter how hard I tried, I just could not figure out why I did not understand what all the other kids found so easy to learn.

One day, I was told that if I got one more E on my report card, I would be taken to the “big prison for kids”.

I tried really hard for weeks. I just couldn’t understand how to make different parts of numbers into whole things.

The day before report cards were to come out, I knew that Mr. Young would give me an E, just like he always did.

I went to Mr. Young and told him that the orphanage (孤儿院) was going to send me to the big prison if I got another E on my report card. He told me there was nothing he could do; it would be unfair to the other kids if he gave me a better grade than I had actually earned. I smiled at him and said, “Mr. Young, do you know how the kids make fun of you because you’re missing your finger?”

He looked at me, moved his mouth to one side and said nothing.

“They shouldn’t do that to you because you can’t help not having a finger, Mr Young. Just like I can’t help not being able to learn numbers and stuff like that,” I said.

The next day, when I got my report card, I tucked it into one of my books. While on the school bus, I opened it: Geography, B+; Mechanical Drawing, C-; English, D-; History, C-; Gym, B+; Art, C; Math, D-.

That math grade was the most favorite one I ever received. Because I knew that someone in the world finally understood what it was like for me to be missing a finger inside my head.

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目前，学校存在少数学生考试作弊现象。某英文杂志社对此现象向中学生征

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