Each member country of WTO must _____ its laws and regulations and complete on the principle

of fairness and cooperation. [ ]

A. cater to

B. correspond to

C. relate to

D. submit to

从口腔临床交叉感染的病原学考虑，最危险而又最典型的感染是

A．真菌感染

B．病毒感染

C．细菌感染

D．原虫感染

E．螺旋体感染