上海市中小第二轮课程改革，将整个学习课程的结构按功能分为（）。

A.基础型课程

B.拓展型课程

C.活动型课程

D.研究型（探究型）课程

For many years, the principle goal of computer (73) was to write short pieces of code that would execute quickly. The (74) needed to be small, because memory was expensive, and it needed to be fast ,because processing power was also expensive.

A．users

B．programmers

C．that

D．program