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【题目】_______birds have come back because the environment here becomes better and better.

A. Thousands of B. Thousand of C. Thousands

【答案】A

【解析】句意:成千上万的鸟回来了,因为这里的环境越来越好。考查数字表达法。数量的表示分确指和概指两种,hundred、thousand、million等前面有具体数字或a few/several等修饰时,词尾一般不加-s,表示确指概念;当表示概指时,词尾要加-s,且与of连用,前面不能用数词修饰。根据句意,本句不是确指,故选A。

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