It is not so much the actual population of the world _______ its rate of increase which is impor
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这句话的原文是：It is not so much the actual population of the world [but] its rate of increase which is important. 重要的并不是世界上人口问题，而是人口增长率的问题。空格处填as也是一样意思，It is not so much the actual population of the world [as] its rate of increase which is important. 与其说人口总数是个问题，不如说人口增长率更成问题。