Pessimistic forecasts say that there is only enough coal for 450 years，enough natural gas for 50 years and that oil might run out in 30 years．
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正确答案:
不乐观的说法是，煤的储量只供450年之用，天然气只满足50年之需，&nBsp;&nBsp;而石油只能用30年。
答案解析:有
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