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 A spaceship flies at about eleven kilometers _______ second.

A. /    B. the C. a     D. an


【解析】此题容易误选B。这是由于思维定势引起的,很多同学认为这里的second是序数词,前面应该用定冠词the修饰。其实,second是“秒”的意思。正确答案为C。


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