填空题

The passage gives a general description of both the advantages and disadvantages brought by a hydrogen economy.

【参考答案】

N
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Compared with other major industrialized countries, the United States depends more heavily on oil import.
单项选择题
The word relegate (Line 5, Para. 3) most probably means __________ .
A．delegate
B．invigorate
C．reduce
D．undermine
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