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【题目】The maths problem looked________ but David took an hour to solve it.

A. serious B. simple

C. silly D. boring

【答案】B

【解析】句意:这个数学题看起来简单,但是David花费了一个小时才解决了它。serious严重的,认真的;simple简单的;silly愚蠢的,傻的;boring令人厌烦的。根据句意but David took an hour to solve it可知,这个数学题看起来是简单的,故应选B。

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