单项选择题

A．There were fewer fish in the river.
B．Over-fishing was prohibited.
C．The local Chamber of Commerce tried to preserve fishes.
D．The local fishing cooperative decided to reduce its catch.
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单项选择题
A scientist being interested in adding to our general knowledge about oxygen would probably call his approach ______.
A．applied science
B．environmental science
C．pure science
D．agricultural science
单项选择题
A．The class is funny.B．The class is boring.C．The class is interesting.D．The class is ridiculous.
A．The class is funny.
B．The class is boring.
C．The class is interesting.
D．The class is ridiculous.
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