-Have you cleaned your room ?-Yes, I’ve cleaned it.A.already, already B.yet, yetC.already, yet D.yet, already 题目和参考答案——青夏教育精英家教网—

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—Have you cleaned your room_____?

—Yes, I’ve_____cleaned it.

A.already, already B.yet, yet

C.already, yet D.yet, already

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A. Though B. Because C. But D. So

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What is true is that the world’s population doesn’t stay the same. It has been increasing at a very fast rate(比例).That’s in part because in each generation(代) these are more people who then have children than in the last generation.

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A. Montana is too crowded

B. Macao is too crowded

C. the world is too crowded

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A. people live longer than before

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B. use more resources

C. think about our ways of living

D. move to other places

5.From the passage we can learn that the writer ________.

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B. thinks the world can feed no more than 7 billion people

C. is not sure when the world’s population will reach 7 billion

D. is not sure what the largest population that the world can feed is

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