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  3. The main reason for the population growth isn’t so much a rise in birth rates ______ a fall in death rates as a result of improv

The main reason for the population growth isn’t so much a rise in birth rates ______ a fall in death rates as a result of improv

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问题 The main 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、but
C、or
D、as
答案B
解析 not so/as…as…意为“不如……”，not…but…意为“不是……而是……”。
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