单项选择题

Tempestuous times preceded the declaration of war.

A．terrible
B．turbulent
C．trying
D．temperate
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单项选择题
Communication satellites generally use solar cells as their source of electric power, although some test satellites have used thermoelectric generators.
A．superior
B．authorized
C．former
D．experimental
单项选择题
Glaciers terminate where the rate of ice loss is equivalent to the forward advance of the glacier.
A．stop
B．turn
C．crack
D．rotate
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