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The author holds that______.

单选题
2021-12-31 19:51
A、mortality rates in developing countries have been brought down by a number of forces
B、medical innovations are the only way to reduce mortality rates in developing countries
C、the upgrading of hygiene and sanitation has played a crucial role in reducing mortality rates in developing countries
D、improved nutrition is the only one factor that reduces mortality rates in developing countries
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正确答案
A

试题解析
解析:文中第二段论述了降低死亡率的多种因素。

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