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问题 选择题
下列各等式成立的是（　　）
A．（
-5
）2=5		B．
(-3)2
=-3		C．
(-4)2
=4		D．
x2
=x
答案

A、错误，

-5
本身没意义；

B、错误，

(-3)2
=3；

C、正确，

(-4)2
=
16
=4；

D、错误，

x2
=x中不知道x的符号，不能直接等于x．

故选C．

问答题

　　“一起来，更精彩！”是广州亚运会志愿者口号，广州亚运会志愿者标识则是这一口号的形象展现。下面是广州亚运会志愿者标识，请从构形角度说明标识的创意，要求语意简明，句子通顺，不超过55个字。

　_________________________________________________________
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单项选择题

A. central bank bases its long-run strategy for achieving price stability on targeting the growth rate of the money supply to equal the difference between the 10-year average growth rate of real GDP and the 4-yearaverage growth rate in the velocity of money. The bank also attempts to reduce the magnitude of business cycles. When the bank’s governing board perceives a significant difference between actual real GDP and full-employment real GDP, they adjust the money supply in the countercyclical direction: Which type of monetary policy is the Central bank following（）

A. Fixed-rule.

B. Discretionary.

C. New Keynesian feedback rule.
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