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    【题目】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：世界上的语言消亡的速度是濒危动物灭绝速度的两倍，是濒危鸟类灭绝速度的四倍。分析可知固定短语at the rate of“以……的速度”，对比选项可知A选项采用“倍数+the+名词+of”的表达方法。故选A。

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