4.  The purpose of her study was to           .

A．watch the wild chimps in cages

B．gain a doctor’s degree

C．understand and respect the lives of chimps

D．live in the forest as men can

为了使模块尽可能独立，要求

A) 模块的内聚程序要尽量高，且各模块间的耦合程度要尽量强
B) 模块的内聚程度要尽量高，且各模块间的耦合程度要尽量弱
C) 模块的内聚程度要尽量低，且各模块间的耦合程度要尽量弱
D) 模块的内聚程度要尽量低，且各模块间的耦合程度要尽量强