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问题 选择题
(x2+
1
2
)2等于（　　）
A．x4+2x2+
1
4
B．x4-x2+
1
4
C．x4+x2+
1
4
D．x4-2x2+
1
4
答案

(x2+

1
2
) 2=x4+x2+
1
4

故应选：C．

问答题 简答题

简为什么离开孤儿院，从这里可以看出她的什么个性
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单项选择题

Construction of the gigantic office building in this city was for years intermittent.

A. stopping and starting at intervals
B. something that will happen soon
C. being watched with keen interest
D. anything that comes and goes
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