---Mrs. Smith, please teach me how to draw on the computer today.

---Oh, no. ____________. You have to get familiar with the keyboard first.

A．Think twice before you do

B．All things are difficult before they are easy

C．Learn to walk before you run

D．Don’t count your chickens before they are hatched

改革开放以来，我国不断大力发展高新技术产业，建立了不少高新技术产业工业园区，其原因有______。

A．发展高新技术产业可以增加地方财政收入
B．发展高新技术产业可以形成新的经济增长点
C．发展高新技术产业可以推动产业结构升级
D．发达国家高新技术产业重心已经转移到发展中国家