单项选择题

世界上海拔最高、线路最长的高原铁路是青藏铁路

A．对
B．错
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We should never content（B级）ourselves with only a little knowledgE.A.convinceB.satisfyC.comfortD.benefit
A.A.convince
B.satisfy
C.comfort
D.benefit
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His new girlfriend had omitted（B级）t0 tell him that she was marrieD.A.flailedB.deletedC.refusedD.rejected
A.A.flailed
B.deleted
C.refused
D.rejected
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