【題目】There are stars in the Galaxy. We can’t count them.

A. billion of B. billions

C. billions of D. Billion

【答案】C

【解析】

試題分析：句意：在銀河系有成十億的星星，我們數(shù)不清它們。根據(jù)句意及題干分析此題表示數(shù)字的籠統(tǒng)概念，此用法需要在hundred，thousand，million及billion等詞后加s，并和of連用，故選C。

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