A high life expectancy coupled with a high crude birthrate(A)makes it difficult to increase per capita GNR. Finally, people have

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问题 A high life expectancy coupled with a high crude birthrate(A)makes it difficult to increase per capita GNR. Finally, people have different views on(B)what is the proper rate of population. Some feel that the earth is too crowded already and(C)that societies should work for zero population growth — the condition in which the average number of births and deaths(D)balances so that a populations stops growing.

选项

答案B

解析 本题考查宾语从句的用法。B选项分句为宾语从句,如果用what,语序应是what the proper rate of population is,因此,此处应该使用which引导宾语从句。因此,B项为正确选项。
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