单项选择题
Recent studies have
identified
four major global environmental risks: acid rain, ozone depletion, deforestation and the greenhouse effect.
A.recognized
B.proved
C.got rid of
D.multiplied
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单项选择题
75()
A.places
B.realms
C.areas
D.domains
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单项选择题
74()
A.food
B.a fire
C.himself
D.it
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