单项选择题
A.On the other hand
B.In contrast
C.But
D.For example
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单项选择题
A.hydraulicB.electricalC.solarD.atomic
A.hydraulic
B.electrical
C.solar
D.atomic
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单项选择题
A.longB.earlyC.veryD.earlier
A.long
B.early
C.very
D.earlier
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