题目内容
17．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 |
分析 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．
解答 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．bigger and bigger越来越大．more and more越来越多．人口应该是越来越多，A不正确．答案是D．
点评 考查比较级，要熟练掌握比较级的变法，根据具体的语境仔细分析选择恰当的比较级形式．
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