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 improve

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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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