均衡价格论是由( )提出的。
A．亚当·斯密
B．L·瓦尔拉
C．A·马歇尔
D．希克斯
参考答案：C
There is ____ as a free dinner in this world, as the saying goes, “No pains, no gains.”
A．no such a good thing
B．such no good thing
C．no such good thing
D．such no a good thing
经卫生部门监测，某理发店毛巾细菌总数不合格，该店毛巾细菌总数可能是
A．＞50个/25cm2B．＞100个/25cm2C．＞300个/25cm2D．＞500个/25cm2E．＞600个/25cm2
