单项选择题

What is the key to oil price in the author's opinion

A．Energy crisis.
B．Dozens of varieties of crude trading.
C．Several challenges facing the oil industry.
D．The rise of resource nationalism.
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单项选择题
Dave O'Reilly and Hugo Chavez. believe that
A．prices of oil and natural gas are very high.
B．prices of oil and natural gas will not go down.
C．oil and natural gas will keep sustained high prices.
D．the world has forgotten about cheap oil.
单项选择题
According to the passage, West Texas Intermediate (Line 4, Paragraph 4) refers to
A．an oil industry.
B．an oil company.
C．a government organization.
D．a kind of crude oil.
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