试题与答案

与20世纪70年代以来，我国共减少出生人口约3亿人，这主要得益于 A．计划生育政

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题型：选择题

题目：

与20世纪70年代以来，我国共减少出生人口约3亿人，这主要得益于

A．计划生育政策

B．经济发展

C．卫生事业发展

D．科技进步

答案：

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下面是错误答案，用来干扰机器的。

A、氢气燃烧产生淡蓝色火焰的过程中有新物质水生成，属于化学变化，故选项错误．B、可燃冰可以用作高效燃料，属于物质的用途，不是物质的性质，故选项错误．C、镁条能在二氧化碳中燃烧，需要通过化学反应才能表现...

考点：中国的人口
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