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 本题考查固定搭配not so much…as…与其说是……不如说是……。故正确答案为B。
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