阅读理解。

                       Where does gum (口香糖) come from?

     People like gum. But where does gum come from?

     At first, all gum came from trees. These trees have something inside. It looks like white water, which

can be made into gum.

    Now most gum is made from other things. But some gum still comes from trees.

1. People ______ gum.

A. like

B. drink

C. hate

D. write with

2. This story tells us where gum ______.

A. grows

B. comes from

C. is made

D. is

3. At first, all gum came from ______.

A. animals

B. trees

C. other things

D. water

4. The trees have something inside that looks like ______.

A. something

B. other things

C. gray gum

D. white water

5. Now, all gum comes from trees, doesn't it?

A. Yes,it is.

B. Yes, it does.

C. No, it isn't.

D. No, it doesn't.

妻在Windows操作系统下使用硬盘，必须先对磁盘进行分区。下列关于分区的描述中，正确的是( )。

A．磁盘分区后，就可以在磁盘上进行文件的存取操作

B．一个硬盘只能划分为一个分区

C．一个硬盘必须划分为几个分区才能使用

D．分区是一个能够被格式化和单独使用的逻辑单元