PASSAGE FOUR [br] What is the key to using wind as a solution to the world energ

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问题 PASSAGE FOUR [br] What is the key to using wind as a solution to the world energy problem ?

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答案 Reducing the cost of wind

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PASSAGEFOUR[br]Whatisthewriter’stoneinthispassage?Approving．文章在第1段讲到了阅