问题标题：
Astheworld'spopulation_____becoming______，wehavetodosomethingtochangethesituation．（）A.is，biggerandbiggerB.are，biggerandbiggerC.are，moreandmoreD.is，moreandmore
问题描述：
As the world's population _____ becoming ______，we have to do something to change the situation．（）
A.is，bigger and bigger
B.are，bigger and bigger
C.are，more and more
D.is，more and more
吕彦峰回答：
答案：D．考查形容词比较级．句意"随着世界人口变得越来越多，我们不得不采取措施改变现状．"．population做主语，表示人口时，谓语动词用单数，因此B，C不正确．biggerandbigger越来越大．moreandmore越来越多．人口应该是越来越多，A不正确．答案是D．
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