从平均成本和边际成本的位置关系中可以看出，当边际成本与平均总成本正好相等时（）曲线处于最低点。

A．边际成本 

B．平均可变成本 

C．平均总成本 

D．平均固定成本

Many foreigners, who used to have a strong________against China, come to realize what a country China really is after the 2008 Beijing Olympics.

A．belief

B．prejudice

C．religion

D．evolution