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词汇 :用所给单词的适当形式填空。

nod use care prevent excellent

1. We should use both sides of paper and _______ plastic bags.

2. Forests can _________ the water from washing the earth away.

3. I asked Mrs. Wang if she would help. She agreed and _______.

4. Qian Xuesen is one of the most _______ scientists in the world.

5. The more _______ you describe it, the more easily we can understand.


 1. reuse  2. prevent  3. nodded  4. excellent  5. carefully


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