The population of Africa is ________ so rapidly as to cause concern of the whole world.
A．expandingB．circulatingC．exportingD．spreading
A
動詞辨析。句意：非洲人口在快速增長，引起了世界的關(guān)注。expand：擴張、發(fā)展；circulate：循環(huán)；export：出口；spread：擴散。
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