选词填空：
The[1 ]is a kind of temporary storage.It is also called main memory(primary memory).
[]是一种临时存储。它也被称为内存(主内存)。
The computer can read from and write to this type of memory,[ 2]can keep data permanently.For PC,the most important types of secondary storage are:floppy disk,hard disk and optical disk.
计算机可读和写这种类型的记忆,[ ]能保持数据永久。PC,最重要的是:辅助存储设备的类型的软盘,硬盘和光碟。
[ 3]and optical disks are portable.They can be inserted into and removed form their disk drives and are kept separately.The[4 ],typically,is not removable.So sometimes it is called[5 ]or"non-removable disk".
[ ]与光碟,便于携带。他们可以插入和删除形成自己的硬盘和保持分开。[ ]一般来说,不是可拆卸。因此,有时叫做[5 ]或“固定磁盘”。
[1]Both floppy disks and hard disks are called[ ].
两张软盘和硬盘
[2]A floppy disk is different from RAM and ROM,which are called the[ ]
软盘是不同于RAM和ROM 所谓的[]
[3]A typical computer system includes a mainframe,peripheral device and[secondary storage]
一个典型的计算机系统包括一个主机,周边设备[ 辅助存储设备 ]
[4]We used to use floppy disks as compact storage devices,but instead,we now use[]most
我们使用软盘紧凑的存储设备,但是相反,我们现在可以使用[]大多数
[5][]provide an interface between the user or application program and the computer hardware.
提供一个用户或程序之间的接口程序和计算机硬件。
可选单词 secondary storage 辅助存储设备
flash 闪光
main memory 主要的记忆
system unit 系统单元
a monitor 一个监视器
fixed disk 固定磁盘
floppy disk 软盘
hard disk 硬盘
random access memory 随机存取存储器
secondary storage 辅助存储设备
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