填空题
Nitrogen is one of noxious gases.
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NC
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Main types of pollution include smog, acid rain, the greenhouse effect, and holes in the ozone layer.
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别人请求帮助时,在什么情况下我们会说“不” 2. 为什么有些人在该说“不”的时候不说“不” 3. 该说“不”时不说“不”的坏处
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