Recent studies have identified four major global environmental risks— acid rain, ozone depletion, deforestation and the greenhou

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问题 Recent studies have identified four major global environmental risks— acid rain, ozone depletion, deforestation and the greenhouse effect.

选项 A、recognized
B、proved
C、got rid of
D、multiplied

答案A

解析

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考博英语

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Recent studies have identified four major global environmental risks— acid rain, ozone depletion, deforestation and the greenhou

考博英语

Uponreachinganappropriateage(usuallybetween18and21years),childrenareencouraged,butnotforced,to"leavethenest"

Uponreachinganappropriateage(usuallybetween18and21years),childrenareencouraged,butnotforced,to"leavethenest"

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(66)Prosperousalumnihelpedmake2006arecordedfund-raisingyearforcollegesanduniversities,whichhauledin$28billion

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