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.
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单项选择题
Boys have a higher risk of developing heart disease than girls.
A．Y
B．N
C．NG
单项选择题
A．California.B．Southern Alaska.C．The arctic.D．Europe.
A．California.
B．Southern Alaska.
C．The arctic.
D．Europe.
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