单项选择题

Questions 18--21 are based on the following passage.
which of the following is elected in the United States

A．President.
B．Vice-president.
C．The members of Congress.
D．All of abov
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单项选择题
According to the passage, what happened in 1848
A．Gold was discovered.
B．Telephone communications were established.
C．The first railroad was completed.
D．The Golden Gate Bridge was constructe
单项选择题
What will be included in tomorrow’s lecture
A．A discussion of air pollution.
B．Predictions of fuel surpluses.
C．Sliders of recently discovered fossils.
D．A description of urban transportation pattern.
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