单项选择题
A.origins
B.sources
C.bases
D.discoveries
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单项选择题
A.seldomB.sometimesC.usuallyD.never
A.seldom
B.sometimes
C.usually
D.never
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单项选择题
A.littleB.muchC.someD.any
A.little
B.much
C.some
D.any
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