单项选择题

A．trace
B．trade
C．trap
D．track
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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.
单项选择题
A．howeverB．thenC．whereasD．further
A．however
B．then
C．whereas
D．further
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