单项选择题

The methods of communication used during the war were （primitive）.

A．reliable
B．effective
C．simple
D．alternative
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单项选择题
The tower remains （intact） even after two hundred years.
A．unknown
B．unusual
C．undamaged
D．unstable
单项选择题
Three world-class tennis players came to （contend） for this title.
A．argue
B．compete
C．claim
D．wish
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