单选题：阅读以下文章，回答题The writer believes that the population explosion

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阅读以下文章，回答题

The writer believes that the population explosion results from
A．an increase in birthrates．
B．the industrial development.　　
C．a decrease in death rates．
D．cultural advances.

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会计凭证是记录经济业务、的书面证明，是的依据。

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