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 A spaceship flies at about eleven kilometers _______ second.

A. /    B. the C. a     D. an


【解析】此題容易誤選B。這是由于思維定勢引起的,很多同學認為這里的second是序數(shù)詞,前面應該用定冠詞the修飾。其實,second是“秒”的意思。正確答案為C。


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