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(2010·湖南湘潭市外国语学校届高三第二次月考)25. 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
C
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(2010·湖南湘潭市外国语学校届高三第二次月考)25. 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
C