单项选择题

A．I agree.
B．Of course, here you are.
C．I’m not interested in it.
D．$ 20.
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单项选择题
It can be inferred from the first paragraph that long time ago many people did not know the sky is ______.
A．a circle
B．space
C．a star
D．a planet
单项选择题
Mr. Plummer traveled to London ______.
A．at rush hour
B．in a first-class compartment
C．in the morning
D．to buy a second-class return ticket
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