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  3. The power produced by the waves, tide and wind ______. Hydrogen ______.

The power produced by the waves, tide and wind ______. Hydrogen ______.

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问题 The power produced by the waves, tide and wind ______.
Hydrogen ______.
选项 A、is a widely-used fuel
B、is not yet in general use as a fuel
C、is not a particularly easy fuel to store
D、is a more economical fuel than wind energy
答案B
解析 细节题。文章最后一句中讲到“unless…we move to the widespread use of a fuel like hydrogen”，这是假设氢燃料的广泛使用，可见氢燃料尚未普遍使用。
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