单项选择题
A.chemicals
B.materials
C.elements
D.matters
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单项选择题
A.an oldB.old oneC.the oldD.old
A.an old
B.old one
C.the old
D.old
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单项选择题
A.aboveB.aroundC.overD.on
A.above
B.around
C.over
D.on
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