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     The Gulf of Mexico（墨西哥湾） is being polluted seriously. That has affected _________ several hundred kinds of sea animals there.

         A. at least     B. at once     C. at birth     D. at times

     A

    词汇辨析。A. at least至少；B. at once立刻，马上；C. at birth生下来时；D. at times有时，偶尔。句意为墨西哥湾被污染的很严重。那已经影响了那里的至少几百种的海洋动物了。故选择A。

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