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     The population of Africa is __________ so rapidly as to cause great concern of the whole world.                                                    

    A. expanding          B. stretching          C. extending                     D. spreading

     

    【答案】

    A

    【解析】

    试题分析:考查动词辨析。A膨胀；B伸展；C延伸D伸展，传播。expand 强调尺寸，人口的增加和体积的扩大；extend 强调空间范围的扩大和时间的延长；spread 伸展，传播；而stretch强调 由曲变直, 由短变长的伸展。根据句意可知A选项正确。句意：非洲人口增长的如此迅猛以至于引起了整个世界的关注。

    考点：考查动词辨析。

     

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