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The population of Africa is________so rapidly as to cause concern of the whole world.

A.expanding       B.stretching

C.extending       D.spreading

 

A

考查动词辨析。expand不仅指尺寸的增加,还可指范围和体积的扩大。stretch一般指由曲变直、由短变长的伸展;extend指空间范围的扩大或长宽的向外延伸,也可指时间的延长;spread一般指向四面八方扩大或传播。

 

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