The main subject of this passage is the______. What drawback is there to the provision of wind power generation?

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问题 The main subject of this passage is the______.
What drawback is there to the provision of wind power generation?

选项 A、The supply method is not yet understood.
B、It’s a non-viable proposition.
C、There is a lack of suitable sites.
D、Theoretical application is still needed.

答案A

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