2. 外语
  3. There are several main types of【B1】______and well-known effects of pollution which are commonly【B2】______. These include smog, a

There are several main types of【B1】______and well-known effects of pollution which are commonly【B2】______. These include smog, a

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问题    There are several main types of【B1】______and well-known effects of pollution which are commonly【B2】______. These include smog, acid rain, the【B3】______effect, and "holes" in the ozone layer. Each of these problems has serious【B4】______for our health and well-being as well as for the whole【B5】______.  
【B1】
There are several main types of pollution and well-known effects of pollution which are commonly discussed. These include smog, acid rain, the greenhouse effect, and "holes"in the ozone layer. Each of these problems has serious implications for our health and well-being as well as for the whole environment.
选项
答案pollution
解析 本句话的意思是：有几种主要的污染。注意pollution为不可数名词。
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