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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 impro

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 impro

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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 本题考查对固定搭配的掌握。not so much…as是固定搭配，意为"与其说是…不如说是…"。
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考研英语一

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