【題目】_______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：成千上萬(wàn)的鳥(niǎo)回來(lái)了，因?yàn)檫@里的環(huán)境越來(lái)越好�？疾閿�(shù)字表達(dá)法。數(shù)量的表示分確指和概指兩種，hundred、thousand、million等前面有具體數(shù)字或a few/several等修飾時(shí)，詞尾一般不加-s，表示確指概念；當(dāng)表示概指時(shí)，詞尾要加-s，且與of連用，前面不能用數(shù)詞修飾。根據(jù)句意，本句不是確指，故選A。

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