单项选择题

The () has become extremely tense. A war could break out any time between the two sides.

A.pollution
B.friendship
C.situation
D.condition

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热门试题

单项选择题

Some birds like to sit on a sheep because ().

A．they can eat its parasites
B．they enjoy travelling with the sheep
C．they depend on the sheep for existence
D．they find the position most comfortable

单项选择题

36().

A．air
B．environment
C．place
D．product