Directions:

In this part, you are asked to write an essay based on the following chart. In your writing, you should

1 ) interpret the chart and

2) give your comments.

You should write at least 150 words.

Write your essay on ANSWER SHEET 2.

Financial Sources of College Students

1.描述中美大学生经济资助状况

2.分析这种状况的成因

3.预测中国大学生经济资助的可能变化

容灾系统通常要采用各种容灾手段来防止灾难发生后的数据损失，以下容灾手段和保持业务持续性无关的是（）。

A．双机热备份

B．双网卡

C．双交换机

D．安装防火墙