单项选择题

A．One of the student’’s friends.
B．The student’’s parents.
C．Either his employer or his university.
D．Both his employer and his university.
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单项选择题
A．His professor.B．Nobody.C．Someone else.D．The author.
A．His professor.
B．Nobody.
C．Someone else.
D．The author.
单项选择题
A．In warm air.B．In cold air.C．When it reaches the polar region.D．Only when the clouds are down low.
A．In warm air.
B．In cold air.
C．When it reaches the polar region.
D．Only when the clouds are down low.
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