单项选择题

A．It’’s cheaper.
B．It’’s safer.
C．It’’s quicker.
D．It’’s convenient.
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单项选择题
A．Air traffic conditions.B．Traffic jams on highways.C．Road conditions.D．New traffic rules.
A．Air traffic conditions.
B．Traffic jams on highways.
C．Road conditions.
D．New traffic rules.
单项选择题
Space policy is dominated by politics.
A．Y
B．N
C．NG
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