题目内容

【题目】I have collected __________ information for my project. I hope it will be successful.

A.a great manyB.a lotC.a number ofD.huge amounts of

【答案】D

【解析】

句意:我为我的项目收集了大量的信息。我希望它会成功。

考查固定搭配。本题四个选项均有“许多、大量”之意,A选项a great many只能用来修饰可数名词,information为不可数名词,故A选项可排除。B选项a lot通常用作副词短语,用来修饰动词,在句子当中充当状语成分,information为名词,故B选项可排除。C选项a number of只可以修饰可数名词复数形式,故C选项可排除。D选项huge amounts of可用来修饰不可数名词,故选D

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【题目】 Young sunflowers turn and swing every day. New findings add to evidence that the plants are animal-like.

Harmer, a professor in the University of California at Davis, Department of Plant Biology, carried out a series of experiments on sunflowers in the field, in pots outdoors and in indoor growth chambers.

By staking plants so that they could not move, Harmer showed that he could destroy their ability to track the sun. He also noticed that sunflowers prevented from moving were not as tough and leafy as those that were free to move. When plants were moved indoor with a settled overhead light, they continued to swing back and forth for a few days.

The indoor plants did start tracking the “sun” again when the apparent source of lighting was moved across the room. The plants could reliably tack the movement and return at night when the artificial day was close to a 24-hour cycle, but not when it was closer to 30 hours.

When sunflowers track the sun, the east sides of their stems grew more rapidly than the west sides. At night, the west sides grew faster as the stem swung the other way. The team identified a number of genes that were expressed at higher levels on the sunward side of the plant during the day or on the other side at night. A plant growth-regulating hormone (激素), called auxin, appears to be a key driver.

The “dance” to the sun cycle obviously slows when the sunflower matures (成熟) and its flowers open up. At that point, the plants stop moving during the day and settle down facing the sun in the east.

“Bees like warm flowers.” Harmer said, adding that the bees are cold-blooded, so landing on a warm flower saves them energy and perhaps feels really good.

“The morning warmth changes the flowers in a way to make them more appealing to insects, perhaps causing them to release more attractive scents earlier in the day.” he said “We’re currently testing this idea.”

1Why did Harmer do the experiment on sunflowers?

A.To see how sunflowers grow upB.To show what sunflowers’ genes are.

C.To study why sunflowers track the sun.D.To check if sunflowers swing in cloudy days.

2What does the underlined word “staking” probably mean in Paragraph 3?

A.breakingB.controllingC.growingD.searching

3What is the result of sunflowers being stopped from moving?

A.They will produce a number of new genes.B.They will grow faster than usual.

C.They won’t swing back though set free.D.They won’t grow well.

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