单项选择题

A．contribute
B．attribute
C．relate
D．concern
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单项选择题
A．traceB．tradeC．trapD．track
A．trace
B．trade
C．trap
D．track
单项选择题
Which of the following best describe the sea resources
A．They are threats to animals and birds.
B．They are unlimited.
C．They can be exhausted of over-harvested.
D．They will be exhausted in the North Atlantic.
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