The population of Africa is __________ so rapidly as to cause great concern of the whole world.                                                    
A．expandingB．stretchingC．extendingD．spreading
A

試題分析:考查動(dòng)詞辨析。A膨脹；B伸展；C延伸D伸展，傳播。expand 強(qiáng)調(diào)尺寸，人口的增加和體積的擴(kuò)大；extend 強(qiáng)調(diào)空間范圍的擴(kuò)大和時(shí)間的延長；spread 伸展，傳播；而stretch強(qiáng)調(diào) 由曲變直, 由短變長的伸展。根據(jù)句意可知A選項(xiàng)正確。句意：非洲人口增長的如此迅猛以至于引起了整個(gè)世界的關(guān)注。
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