对软土地基,一般可采用哪几种地基处理方法？

Direction：For this part，you have to write a short passage on the topic：Volunteer Teaching in the West．You should write at least 150 words following the outline given below in Chinese：
1．每年，高校许多大学生受到鼓舞去贫困地区支教；
2．支教活动的意义；
3．你的看法。