题目内容

【题目】 Whenever I met her，__________ was fairly often, she greeted me with a sweet smile.

A. who B. which C. when D. that

【答案】B

【解析】句意：无论我何时遇到她一这种事常发生，她都会以甜蜜的微笑向我打招呼。__________ was fairly often是个定语从句，关系词在从句中充当主语，代替Whenever I met her。

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【1】 The couple have not got a television, because ________.

A. they are not rich enough

B. they are strange people

C. they enjoy spending evenings in their own ways

D. they don't know what to do when there are power cuts

【2】 Both of them are interested in __________.

A. earning languages

B. travelling

C. staying home alone

D. watching people play games

【3】 At night when there is no electricity, the couple ________.

A. have to look at the walls

B. can do nothing but sit in silence

C. will have many visitors

D. have to go out for candles

【4】 The writer tries to tell us that ________.

A. life is possible without a television

B. life is enjoyable with many friends

C. electricity is important

D. television is useful

【5】 The best title for this passage is ________.

A. Why Do We Need a Television?

B. Candle! But No Electricity!

C. Different Friends, Different Hobbies.

D. We Go Without Televisions ！

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Plant scientists are just beginning to understand this chemical “language”. Cahill says studies have shown, for example, that plants can evaluate 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 that alerts other plants nearby.

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“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.

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A. communicate with other living things in a chemical way

B. hardly react to any sudden change in temperature

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A. walk away from trouble

B. change its chemistry to kill the insect

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

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

【3】The underlined word “alerts” most probably means “___________”.

A. warns B. protects

C. threatens D. allows

【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

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