【題目】Ninety ____ teachers and students plant _____ trees every year.

A. thousands, million of

B. thousand, millions of

C. thousands of, millions of

D. thousand, million

【答案】B

【解析】

試題句意：九萬老師和學(xué)生每年種百萬棵樹；注意前邊有具體數(shù)字的時(shí)候thousand不能變復(fù)數(shù)，當(dāng)表示約數(shù)的時(shí)候要和of短語連用，并要變復(fù)數(shù)。millions of+名詞的復(fù)數(shù)；thousands of,+名詞的復(fù)數(shù)；故選B

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