According to ______, the appropriate goal of psychology is to understand the environmental conditions that would cause an animal or human to behave in a particular way.

A. behaviourist psychology


B. cognitive psychology
C. psychoanalysis



D. Gestalt psychology

如果一个公司有1000台主机，则至少需要给它分配______个C类网络。为了使该公司的网络地址在路由表中只占一行，给它指定的子网掩码必须是______。这种技术叫作______技术。

A．2
B．4
C．8
D．16