第35题: [单项选择]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 参考答案:B 答案解析:[试题分析] 本题考查对固定搭配的掌握。
[详细解答] not so much…as是固定搭配,意为“与其说是……不如说是……”,故选项[B]为正确答案。