单项选择题


A．On the contrary
B．On the average
C．On the whole
D．On the other hand
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单项选择题
Because of the snow, many parts of the countryside are only ______ by helicopter.
A．accessible
B．auxiliary
C．conditional
D．expressive
单项选择题
An attempt to rescue the American ______ ended in disaster when a helicopter crashed.
A．captives
B．hostages
C．convicts
D．hosts
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