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I don't know _______ he will come tomorrow. ________ he comes, I'll tell you.

A. if; Whether B. whether; Whether

C. if; That D. if; If

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阅读表达 阅读短文,按要求回答短文后的五个问题。

All living things on the earth need other living things to live on. Nothing lives alone. Most animals must live in a group, and even a plant grows close together with others of the same kind. Sometimes one living thing kills another, one eats and the other is eaten. Each kind of life eats another kind of life in order to live, and together they form a food chains (链). Some food chains are simple, while others are not. But all food chains begin with the sun, and all food chains become broken up if one of the links disappears (消失).

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回答下面五个问题,每题答案不超过11个词。

1.How does a plant grow?

________________________________________________________________________________

2.Why does each kind of life eat another kind of life?

________________________________________________________________________________

3.If one of the links disappears, what may happen?

________________________________________________________________________________

4.When can animals use the sun’s energy?

________________________________________________________________________________

5.What’s the result of breaking the links?

________________________________________________________________________________

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