We will have a picnic it doesn’t rain tomorrow.A. though B. unless C. until D. if 题目和参考答案——青夏教育精英家教网—

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We will have a picnic ________ it doesn’t rain tomorrow.

A. though B. unless C. until D. if

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It happens every spring. Flowers come out everywhere on the same day. But how do plants “know” when to flower?

For years, it has been a difficult question for scientists. But a US research group may have finally answered it—the secret lies in a protein(蛋白质)called FKF1. This helps plants to know when the days become long and when they get short. Then they can tell the seasons are changing.

Researchers found the FKF1 protein when they were studying a plant called Arabidopsis(拟南芥). It is sensitive(敏感的)to sunlight, and can be made active by sunlight.

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1. The passage is mainly about ____.

A. how plants “know” when to flower

B. what people can do with plants

C. how seasons are changing

D. what kind of plant Arabidopsis is

2.Scientists found the FKF1 protein when they were____.

A. answering a question

B. controlling the clours of flowers

C. planting flowers in the garden

D. studying a plant called Arabidopsis

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A. it rains in spring

B. there is light in the late afternoon

C. it is getting dark

D. the sun goes down early

4.Scientists believe that____.

A. other plants also know when to flowers

B. flowers are more valuable than fruits and vegetables

C. people have known how to control when flowers come out

D. if the weather is cold and days are short, plants will flower

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- Sure. There's a flower store on the second floor.

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1.If you want to improve your writing skills, you can call________

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--- Have you finished drawing your picture _____, Tom?

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A. yet; yet B. already; already

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