—Can I         my hair colored, Mom?

—No. As a student, you ________ do that.

A．let; are allowed to

B．got; should be allowed to

C．get;may not

D．get; shouldn’t be allowed to

有关原型化的论述中一般将系统的需求定义策略划分为 【19】 定义策略和原型定义策略。