以下哪一项不能使LM曲线产生位移（）。
A.公开市场业务
B.降低法律准备金
C.通货膨胀
D.扩大政府购买
参考答案：C
下列物质暴露在空气中会变质的是 [ ]
A．浓
B．浓盐酸
C．NaOH固体
D．NaCl晶体
Of course, there have been times, as a young man, when I got tired from study and devoted my time to playing.()
A. tired of
B. got tired of
C. tired up
D. used to tire of
