() 19. Every year , fishes are killed by the polluted water and many people are made sick by the polluted air. A. thousand of B. thousands of C. two thousands D. two thousands of 题目和参考答案——青夏教育精英家教网—

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() 19. Every year , fishes are killed by the polluted water and many people are made sick by the polluted air.

A. thousand of B. thousands of C. two thousands D. two thousands of

19.B

题目来源：2016年同步训练九年级英语下册人教版 > 过关测试一（Unit 11~Unit 12）

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North American black bears are shy animals. They are fearful by nature and will usually run away if they see or hear people. Because of this it can be difficult for scientists to learn about these animals.

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Girls wore grey skirts and white shirts,boys wore grey trousers, ^.nd everyone wore the school tie.

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