单项选择题

John is collaborating with Mary in writing an article.

A．cooperating
B．competing
C．combining
D．arguing
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单项选择题
These programmes are of immense value to old people.
A．natural
B．fatal
C．tiny
D．enormous
单项选择题
The river widens considerably as it begins to turn west.
A．twists
B．stretches
C．broadens
D．bends
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