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【参考答案】

O
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单项选择题
A．It is more exciting than space travel.B．It is much cheaper than space travel.C．It is much safer than space travel.D．It is less time-consuming than space travel.
A．It is more exciting than space travel.
B．It is much cheaper than space travel.
C．It is much safer than space travel.
D．It is less time-consuming than space travel.
填空题
B
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