单项选择题

A．Early miners.
B．Spanish explorers.
C．African naturalists.
D．Early industrialists.
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单项选择题
A．A lecture in their American literature course.B．A film about the American frontier.C．A book they both read.D．The woman’s recent trip to the American Midwest.
A．A lecture in their American literature course.
B．A film about the American frontier.
C．A book they both read.
D．The woman’s recent trip to the American Midwest.
填空题
Concerning the future of the hydrogen economy, the most obvious step we will take is______.
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