The main advantage of wind powered stations is that______. The main disadvantage of wind power is that it______.

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问题 The main advantage of wind powered stations is that______.
The main disadvantage of wind power is that it______.

选项 A、is competitive
B、produces more pollutants
C、is low in efficiency
D、is ugly

答案C

解析 判断题。根据文章第三段的这句话;At present,however,installation and running costs and low efficiency mean that wind power is not economically competitive with conventional fossil or nuclear stations.可得出答案。
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