【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 the rate of

【答案】A

【解析】句意：世界上的語言消亡的速度是瀕危動物滅絕速度的兩倍，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”，對比選項可知A選項采用“倍數(shù)+the+名詞+of”的表達(dá)方法。故選A。

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