单项选择题

求n个数的最小值至少需要（）次比较

A．n
B．n-1
C．n+1
D．n-2

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单项选择题

具有“主治节”功能的脏是

A．肝
B．心
C．脾
D．肺
E．肾

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They were killed by __________ US soldiers on explicit orders, based on the suspicion that the civilians were harbouring enemy soldiers.
A、recoiling
B、retreating
C、refraining
D、restraining