单项选择题

A．Taking the air.
B．By plane.
C．On radio and TV.
D．At the airport.
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单项选择题
A．In a little while.B．First thing in the morning.C．Pretty quick.D．By 8:00 pm.
A．In a little while.
B．First thing in the morning.
C．Pretty quick.
D．By 8:00 pm.
单项选择题
A．To help mariners.B．To improve ship design and sailing methods.C．To study astronomy and mathematics.D．To improve his own skill as a sailor.
A．To help mariners.
B．To improve ship design and sailing methods.
C．To study astronomy and mathematics.
D．To improve his own skill as a sailor.
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