Pollution has become a serious problem in almost all the big cities of the w

游客2023-10-02  26

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? [br] 【B4】

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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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