【題目】Languages across the world are becoming extinct ______ endangered mammals and four times endangered birds.

A. at twice the rate of B. as twice fast as

C. twice faster as D. twice at rate of

【答案】A

【解析】句意：世界上的語言消亡的速度是瀕危動(dòng)物滅絕速度的兩倍，是瀕危鳥類滅絕速度的四倍。分析可知固定短語at the rate of“以……的速度”，對(duì)比選項(xiàng)可知A選項(xiàng)采用“倍數(shù)+the+名詞+of”的表達(dá)方法。故選A。

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