单项选择题

A．Watch for changes in weather.
B．Watch their altitude.
C．Check for weak spots in their balloons.
D．Test the strength of the ropes.
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单项选择题
A．A clerk.B．A student.C．A maths teacher.D．A telephone operator.
A．A clerk.
B．A student.
C．A maths teacher.
D．A telephone operator.
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