单项选择题

A．Try to change his reservations.
B．Travel by train instead of by plane.
C．Continue trying to get a ticket.
D．Cancel his December travel plans.
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单项选择题
A．To check the accuracy of scales.B．To calculate the density of other metals.C．To observe changes in the atmosphere.D．To measure amounts of rain fall.
A．To check the accuracy of scales.
B．To calculate the density of other metals.
C．To observe changes in the atmosphere.
D．To measure amounts of rain fall.
单项选择题
A．Repeat it aloud.B．Write it down.C．Make a mental picture of it.D．Practice recalling it.
A．Repeat it aloud.
B．Write it down.
C．Make a mental picture of it.
D．Practice recalling it.
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