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  3. The chief reason for the population growth isn’t so much a rise in birth rates______a fall in death rates as a result of improve

The chief reason for the population growth isn’t so much a rise in birth rates______a fall in death rates as a result of improve

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问题 The chief reason for the population growth isn’t so much a rise in birth rates______a fall in death rates as a result of improvements in medical care.
选项 A、and
B、as
C、but
D、or
答案B
解析 not so much a rise in birth rates as a fall in death rates.“并非是(由于)出生率的增长，而是(由于)死亡率的下降”。not so much A as B是个很有用的句式，还可以把这个句式改写为not A but B；B rather than A。
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考研英语一

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