单项选择题

A．He is very quiet.
B．He gives amusing lectures.
C．He should give more than one series of talks.
D．He lectures only to the serious students.
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单项选择题
The space agencies are reluctant to open up space to tourists.
A．Y
B．N
C．NG
单项选择题
A．Energy conservation.B．A new kind of transportation.C．Strip cities.D．Advantages of air transportation over rail roads.
A．Energy conservation.
B．A new kind of transportation.
C．Strip cities.
D．Advantages of air transportation over rail roads.
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