单项选择题
A.on
B.while
C.as
D.at
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单项选择题
A.substanceB.resourceC.sourceD.material
A.substance
B.resource
C.source
D.material
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单项选择题
A.fistB.histC.gistD.list
A.fist
B.hist
C.gist
D.list
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