英语语法问题 one 与 the one

问题描述:

英语语法问题 one 与 the one
请比较下面两道题 (用one,the one填空)谢谢
1
——what can I do for you?
——I'd like to buy a present for my son,__at a proper price but of great use.
2
——where have you spent this term's scholarship?
——On a computer,___ on the deskover there.

one是任意一个,the one是特指某一个.
I'd like to buy a present for my son--one at a proper price but of great use.买一个价格合适但有用的礼物
on a computer--the one on the desk over there.奖学金花来买电脑了,就是那边桌上的那台.