According to the passage, which of the following is the most polluting energy resource? One of the problems with wind farms is

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问题 According to the passage, which of the following is the most polluting energy resource?
One of the problems with wind farms is that

选项 A、there is not enough wind.
B、wind is not reliable.
C、they can only be built on the sea.
D、they might influence the world economy.

答案B

解析
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