单项选择题
The methods of communication used during the war were (primitive).
A．simple
B．reliable
C．effective
D．alternative
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单项选择题
The contract between the two companies will (expire) soon.
A．shorten
B．end
C．start
D．resume
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单项选择题
This species has nearly (died out) because its habitat is being destroyed.
A．turned dead
B．passed by
C．carried away
D．become extinct
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