单项选择题

The writer of the article was, undoubtedly ______.

A．a linguist
B．an attorney
C．a scientist
D．an essayist
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单项选择题
According to the passage, what is black gold
A．Gold ore.
B．Sstolen money.
C．Whale oil.
D．Crude oil.
单项选择题
Why does the author mention the California gold rush
A．To indicate the extent of United States mineral wealth.
B．To argue that gold was more valuable than oil.
C．To describe the mood when oil was first discovered.
D．To explain the need for an increased supply of gold.
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