题目内容
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.
A. and B. as C. but D. or
B
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题目内容
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.
A. and B. as C. but D. or
B