假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下短文。短文中共有10处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在此符号下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

       2）只允许修改10处，多者（从第11处起）不计分。

    China's higher education is developing very fast.The number of college students are quite small in the 1980s, now nearly fourteen million students are studying in colleges and universities.

    Why does China's higher education develop such quickly? Several factors contribute to it. First of all, its quick development results China's rapid socially and economic development.Through the reform and opening up, people have become richer and have much money to invest in education. Secondly, our government had attached great importance to higher education and taken out practical measures to encourage people to go to college. Beside, with the development of society, more and more people hope to receiving higher education.

一台机器原价60万元，如果每年的折旧率均为x，两年后这台机器的价位约为y万元，则y与x的函数关系式为（　　）