单项选择题

A．Traveling in it.
B．Studying its language.
C．Living in it.
D．All of the above.
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单项选择题
Sugihara wants to harness market forces to prevent over-fishing which governments and the scientists could not often achieve so far.
A．Y
B．N
C．NG
单项选择题
A．There was no garbage left to clean up.B．There was more garbage than before and they had to work harder.C．The fiver had become so clean that a lot of water-birds came back.D．The river was much cleaner and they had to search for garbage.
A．There was no garbage left to clean up.
B．There was more garbage than before and they had to work harder.
C．The fiver had become so clean that a lot of water-birds came back.
D．The river was much cleaner and they had to search for garbage.
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