单项选择题

A．sea
B．space
C．air
D．water
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单项选择题
A．strongerB．largerC．smallerD．weaker
A．stronger
B．larger
C．smaller
D．weaker
单项选择题
A．He established a government service.B．He developed a system called star routes .C．He built a lot of post offices.D．He established the postal system.
A．He established a government service.
B．He developed a system called "star routes".
C．He built a lot of post offices.
D．He established the postal system.
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