2. 外语
  3. Pollution has become a serious problem in almost all the big cities of the world. City people are becoming more and more worried

Pollution has become a serious problem in almost all the big cities of the world. City people are becoming more and more worried

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问题     Pollution has become a serious problem in almost all the big cities of the world. City people are becoming more and more worried about how they can【B1】______pollution. They are also concerned about whether the government is doing enough to【B2】______the environment. However, people in Ireland don’t have these worries. They are sure that they have found the【B3】______the problem. They use windmills. These windmills can create power without【B4】______pollution. This method is so successful that other countries are【B5】______doing the same. Why not? What works for Ireland can work for any other country?
【B4】
选项
答案creating
解析 因为放在介词without之后，所以用动名词形式。
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