单项选择题

Researchers say a small pond of algae could produce enough hydrogen gas to meet the______ fuel needs for a dozen or so cars.

A．weekly
B．monthly
C．yearly
D．daily

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单项选择题

单项选择题

Researchers say a small pond of algae could produce enough hydrogen gas to meet the______ fuel needs for a dozen or so cars. 您的浏览器不支持 audio 元素。