题目内容

Wemustfindadifferentkindofenergytouseinsteadoffossilfuel.

A. cheaper
B. cleaner
C. newer
D. alternative

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Acarthatonlyusessunenergyandnotfossilenergylikepetrolisveryenvironmentallyfriendly.

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A. carefully
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A. work
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A. papering
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