单项选择题

A．Kid’s play balloons.
B．Weather balloons.
C．Balloons for safety patrols.
D．Balloons for recreation.
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单项选择题
A．On the plane.B．On a train.C．On a bus.D．In an automobile.
A．On the plane.
B．On a train.
C．On a bus.
D．In an automobile.
单项选择题
A．They are usually very high.B．They are always very low.C．they can be very different.D．They are actually the same.
A．They are usually very high.
B．They are always very low.
C．they can be very different.
D．They are actually the same.
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