单项选择题


A.wasting
B.considering
C.taking
D.waiting
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单项选择题
A.aboutB.atC.onD.for
A.about
B.at
C.on
D.for
单项选择题
A.Air pollutionB.Water pollutionC.Some diseasesD.All farm land
A.Air pollution
B.Water pollution
C.Some diseases
D.All farm land
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