2. 自考
  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 improv

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 improv

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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 improvement in medical care.
选项 A、and
B、as
C、but
D、or
答案B
解析
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