单选题:What does the author think of biofuels?

题目内容:
What does the author think of biofuels? A.They keep America’s economy running healthily.
B.They prove to be a good alternative to petroleum.
C.They do not provide a sustainable energy supply.
D.They cause serious damage to the environment.

参考答案:
答案解析:

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The destruction of coral on the Great Barrier Reef is inevit

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