题目内容
There are ___________ changes in environmental conditions from freezing cold to extremely hot, and from dry to very humid (潮湿的).
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From a practical ___________, how can you reduce production costs and at the same time minimize the risks involved?
Child mortality (死亡率) decreased due to improvements in medical care and greater attention to problems related to proper ___________.
The disaster is already set to be the world's worst for ground casualties ___________ by a crashing aircraft.
With Spring Festival drawing nearer, people are glowing with happiness, and are full of hope; this excitement is ___________ before New Year's Eve.
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