257、Registers can be into special registers and general registers.

5、had better () sth.

4、dream () doing sth

3、Along with her great success, however, Natalie Cole has lived in a () of drugs, crime, and failemarrages

2、in fashion是

1、out of fashion是

360、Most operating systems a file system, as a file system is an integral part of any modern operating system.Early microcomputer operating systems ＇ only real task was file management — a fact reflected in their names ( ).Some early operating systems had a separate component for handling file systems was called a disk operating system.some microcomputers, the disk operating system was loaded separately from the rest of the operating system.On early operating system s, there was usually support only one, native, unnamed file system; for , CP/M supports only its own file system , which might be CP/M file system” if needed, but which d id n’ t bear any official name at all. of th is, there needs to be an interface provided by the operating system software between the user and the file system.This can be textual ( ) or graphical ( ).If -, the metaphor of the folder containing docum ents, other files, and nested folders often used

359、The chief disadvantage of a low — altitude orbit lies in the rate at which a satellite must travel.Because their period of rotation is fas/er than the rotation of the earth, satellite in lower orbits do not stay above a single point on the earth ＇ s surface.Instead, an observer, who stands on the earth looking upward through a telescope, sees such satellite move across the sky.In fact, a single satellite can complete an entire orbit in approximately 1.5 hours.

358、Maintenance begins after the system is released.As people use i t, they will suggest minor improvements and enhancements.Occasionally, bugs slip through debug and testing, and removing them is another maintenance task.

357、Positioning your firewall between an internal and external router provides little additional protection from attacks on either side, but it greatly reduces the amount of traffic the firewall server must evaluate, which can increase the firewall＇ s performance.

356、近年来,随着因特网覆盖范围的扩展,引人了一组国