【題目】A billion is one thousand______.
A.hundred
B.thousand
C.million
D.millions

【答案】C
【解析】句意:十億就是一千個(gè)一百萬。hundred、thousand、million等前有數(shù)詞修飾是不加-s。加-s時(shí)后跟of。故選C。

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