题目内容
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
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题目内容
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