任务型阅读。

     Every year, millions of Chinese college students from poor families face money problems. The problem

has become a major one for the whole country. There is a national survey by the China Foundation for

Poverty Alleviation (中国扶贫基金会) to learn more about college students' life. Here are some of the results.

1.________ of Chinese college students have to worry about paying for their education.

2.About ________% of the students spend over 200 yuan per month.

3.From the first chart,we know that about one fifth of the students spend no more than ________ 5 yuan

   every month.

4.The ________ students mostly get subsidies from state loans.

5.We can see that the students get the least ________ from society.

读地壳物质循环图分析，下列叙述正确的是：（）

A.①是沉积岩

B.②是岩浆岩

C.③是变质岩

D.④是岩浆