单项选择题

Light goes three quarters of the way from the earth to the moon in one second．

A．光一秒钟以后能走完25%的距离，从地球到月球。
B．光在一秒钟内可以完成地球到月球距离的四分之三。
C．光一秒可以走过地球至月球距离的四分之三。
D．光一秒钟可以通过地球到月球距离的四分之三。
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单项选择题
Compared with trains and planes, the disadvantage of buses is their ______.
A．cheap fare
B．frequent travel
C．speed
D．directness
单项选择题
Long-distance buses give people the chance to travel across ______.
A．huge and continuous sections of land
B．large and beautiful land
C．small but beautiful land
D．huge districts of land
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