It is just ____ among countries to host the Olympics as to win an Olympic medal.

A．so fierce a competition

B．as fierce a competition

C．such a fierce competition

D．too fierce a competition

访谈法的局限性主要有（）

A.易受访谈对象的“警戒”心理或不苟言语的个性特点的影响

B.易受研究者自身素质的影响

C.某些问题不宜进行访谈

D.对环境的要求比较苛刻