单项选择题
A.resource
B.background
C.reason
D.basis
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单项选择题
A.howeverB.thereforeC.thoughD.thereby
A.however
B.therefore
C.though
D.thereby
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单项选择题
A.rateB.thicknessC.proportionD.density
A.rate
B.thickness
C.proportion
D.density
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