题目内容

Polar explorers have to be extremely （）to endure the abominable climate and other hardships.

A. rough
B. hard
C. tough
D. cautious

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有一个长度为12的有序表，按折半查找法对该表进行查找，在表内各元素等概率情况下，查找失败时所需的平均比较次数是（）。

A. 37/12
B. 62/13
C. 39/12
D. 49/13

It is unimaginable for someone in such a high ______ in the government to behave so badly in public.

A. situation
B. position
C. profession
D. appointment

CSMA/CD以太网中，发生冲突后，重发前的退避时间最大是( )。

A. 65536个时间片
B. 65535个时间片
C. 1024个时间片
D. 1023个时间片

Immediate solution should be（）to save the people from the flood that has swept southern China this summer.

A. called at
B. called for
C. called on
D. called in