关于盈亏平衡分析的论述，下列说法中正确的是（）。

从供选择的答案中选出应填入下列英文语句中( )内的正确答案。

供选择的答案：

(1) manage (2) perform (3) support (4) reduce (5) divided

(6) enhance (7) implemented (8) introduce (9) ranked (10) run

从下面提供的答案中选出应填入下列英文语句中______内的正确答案。

By using MP3, a 600M-byte music CD can be(1)to 50M bytes or less. It can be streamed (downloaded in chunks) so that you can begin listening to the opening bars while the(2)of the life arrives in the background. And, most important, MP3 music files retain good listening(3)that(4)compression schemes lacked. That(5)of features makes accessing and distributing music on the Web practical for the frst time.

从供选择的答案中选出应填入英语文句中()内的正确的答案。

Software design is a(A) process. It requires a certain (B) of flair on the part of the designer. Design can not be learned from a book. It must be practiced and learnt by experience and study of existing systems. A well (C) software system is straight forward to implement and maintain, easily (D) and reliable .Badly (C) software systems, although they may work are (E) to be expensive to maintain, difficult to test and unreliable.

A: ① create ② created ③ creating ④ creative

B: ① amount ② amounted ③ mount ④ mounted

C: ① design ② designed ③ designing ④ designs

D: ① understand ② understands ③ understanding ④ understood

E: ① like ② likely ③ unlike ④ unlikely

从供选择的答案中选出应填入英语文句中()的正确的答案。

You should be (A) of developing your program, using something better than the method that uses the philosophy: write (B) down and then try to get it working. Surprisingly, this method is wide used to day with result that an average programmer on an average job (C) out only between five to ten lines of correct code per day. We hope your (D) will be greater. But to improve requires that you apply some discipline to the (E) of creating programs.

A: ① available ② capable ③ useful ④ valuable

B: ① anything ② nothing ③ something ④ thing

C: ① does ② looks ③ turns ④ runs

D: ① activity ② code ③ productivity ④ program

E: ① process ② experience ③ habit ④ idea

从供选择的答案中选出应填入英语文句中()的正确的答案。

Software quality assurance is now an (A) sub-discipline of software engineering. As Buckly and Oston point out, (B) software quality assurance is likely to lead to an ultimate (C) of software costs. However, the major hurdle in the path of software management in this area is the lack of (D) software standards. The development of accepted and generally applicable standards should be one of the principal goals of (E) in software engineering.

A: ① emerging ② emergent ③ engaging ④ evolve

B: ① effective ② effortless ③ light ④ week

C: ① balance ② growth ③ production ④ reduction

D: ① usable ② usage ③ useless ④ useness

E: ① management ② planning ③ production ④ research

从供选择的答案中选出应填入英语文句中()的正确的答案。

Software products may be (A) into four basic types: application programs, programming language processors, operating systems, and system utilities.

Application programs are programs that (B) useful tasks such as solving statistical problems, or keeping your company's books.

Programming language processors are programs that (C) the use if a computer language in a computer system. They are tools for the development of application programs.

Operating systems are programs that (D) the system resources and enable you to run application programs.

System utilities are special programs that (E) the usefulness of or add capabilities to a computer.

A～E: ① manage ② perform ③ support ④ reduce

⑤ divided ⑥ enhance ⑦ implemented ⑧ introduce

⑨ ranked ⑩ run

从供选择的答案中选出应填入英语文句中()的正确的答案。

Applications put computers to practical business (A), but below the (B) it's the heart of an operating system the kernel that provides the technical wizardry to juggle multiple program, connect to networks and store (C) .

A traditional kernel provides all the functions for applications. The kernel (D) memory, I/O devices and parcels out processor time.

The kernel also supports security and fault (E), which is the ability to recover automatically when parts of the system fail.

A: ① used ② use ③ apply ④ applied

B: ① earth ② bottom ③ table ④ surface

C: ① graphics ② data ③ text ④ image

D: ① manages ② manage ③ managed ④ managing

E: ① error ② question ③ tolerance ④ problem

从供选择的答案中选出应填入下列英文语句中______内的正确答案。

Perhaps you have been asking the questions: Is everyone moving to(1)？ If l don't step up to the(2)user interface, will I be left all along at the cold(3)command line？

Don't throw away your DOS(4). No one is(5)DOS's death knell yet. DOS and its applications people have been using for years are not going to stop working overnight.

供选择的答案：

(1) DOS (2) UNIX (3) Windows (4) Windows NT (5) graphical

(6) software (7) replacing (8) sounding (9) text (10) hardware

从供选择的答案中选出应填入英语文句中()的正确的答案。

The C programming language has (A) one of the most (B) programming languages, and it has been implemented on most personal computers and multiuser systems, especially those designed for research and development. It evolved from the version described in Kernighan and Ritche's work (called "K&R C" after the authors into(C) variants, including the standard ANSI C, which (D) many type-checking features and includes a standard library. Of the two main (E), K&R C is probably the most commonly used on multiuser computers, with ANSI C close behind in the personal computing world, ANSI C is far more common.

A～E:

① much ② variants ③ complex ④ incorporates ⑤ several

⑥ become ⑦ popular ⑧ editions ⑨ come ⑩ users

从供选择的答案中选出应填入英语文句中()的正确的答案。

Toolboxes and menus in many application programs were (A) for working with the mouse. The mouse controls a pointer on the screen. You move the pointer by (B) the mouse over a flat surface in the direction you want the pointer to move. If you run out of (C) to move the mouse, lift it up and put it down again. The pointer moves only when the mouse is (D) the flat surface. Moving the mouse pointer across the screen does not affect the document, the pointer simply (E) a location on the screen. When you press the mouse button, something happens at the location of the pointer.

A: ① assigned ② designed ③ desired ④ expressed

B: ① putting ② sliding ③ serving ④ taking

C: ① board ② place ③ room ④ table

D: ① getting ② going ③ teaching ④ touching

E: ① constructs ② indicates ③ instructs ④ processes