单项选择题
A.different
B.usual
C.important
D.chemical
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单项选择题
A.gasesB.piecesC.thingsD.gas
A.gases
B.pieces
C.things
D.gas
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单项选择题
A.describeB.uniteC.mixD.reveal
A.describe
B.unite
C.mix
D.reveal
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