计算机专业英语第3次作业1.machine languages are the most basic type of programming languages and can be understood undirectly by a computer.错误2.High-level languages are programming languages that must first be translated into a machine language before they can be understood and processed by a computer.正确3. C, C++, PASCAL, and FORTRAN is__D___?A：Assembly languagesB：machine languagesC：Low-level programming languagesD：high-level languages4.In machine languages, instructions are written as sequences of __A__?A：1s and 0sB：0123456789._____is a means of connecting a number of computing elements together. BA：WANB：LANC：MAN6.The internet grew out of a computer network called__C__?A：LANB：WANC:ARPANET7./downloads/pryearbk.asp.The http indicates__C__?A：the hostnameB：filesC:PROTOCOLputer crime can take various forms, including____?A：DamageB：TheftC：Manipulation正确答案：ABC9.Security measure consist of______?A：encryptionB：restricting accessC：anticipating disastersD：making backup copies正确答案：ABCDputer viruses activate when the instructions---or executable code----that run programs are opened.答案：正确11.I have no doubt_____he will overcome all his difficultiesA：whichB：whatC：thatD：if正确答案：C12.写出下列术语的英文或中文意思。

1.disk drive参考答案：1.磁盘驱动器2.可擦写光驱2.CD-RW3.object code 3.目标代码4. 应用程序4.application program5. 万维网浏览器.Web browser13：[论述题]13.阅读下列短文，从A、B、C、D四个选项中，选出最佳选项。

We are used to the idea of aging in ourselves. We are so used to this that it comes as a surprise to find that there may be some animals that do not age. Sea anemones(海葵) are an example. Some have been kept for nearly a century without showing any signs of lifelessness. Some kinds of sea worms can even "grow backwards." If kept in the dark and given nothing to eat, they get steadily smaller, They finally end as a ball of cells(细胞) looking rather like the egg from which they came. Under good conditions the ball will turn back to a worm and start growing again. One could probably keep them growing and un-growing again and again.1. Some sea worms grow smaller when they ______.A. lose weightB. live in the darknessC. are under good conditionsD. don't eat and are kept in the dark2. According to the passage, some sea animals ________.A. will die when they become a ball of cellsB. do not grow oldC. will die without foodD. will stop growing any time they want3. According to the passage, which of the following statements in NOT true?A. We can keep certain kind of sea worm growing and un-growing again and again.B. Human beings will grow old and die.C. An anemone is a king of sea worm that can grow backwards.D. Some anemones will live nearly a hundred years.4. The underlined word aging in the first sentence means ______.A. growing oldB. the age of a personC. getting youngerD. un -growing5. This passage is mainly about ______.A. sea animalsB. cellsC. agingD. anemonesThe word horsepower was first used two hundred years ago. James Watt had made the world's first widely used steam engine. He had no way of telling people exactly how powerful it was, for at that time there were no units for measuring power.Watt decided to find out how much work one strong horse could do in one minute. He called that unit one horsepower. With this unit he could measure the work his steam engine could do.He discovered that a horse could lift a 3300-pound weight 10 feet into the air in one minute. His engine could lift a 3300-pound weight 100 feet in one minute. Because his engine did ten times as much work as the horse, Watt called it a ten horsepower engine.6. The selection says that Watt made the first .A. engineB. steam engineC. widely used steam engineD. useful engine7. watt wanted to find a way to .A. measure the work his engine could doB. tell people how powerful his engine wasC.lift a 3300-pound weightD. both A & B8. One horsepower would equal the .A. work a horse could do in a minuteB. weight a horse could liftC. work a horse could do in ten minutesD. weight of one horse9. He made up a unit of measurement based on the strength of .A. a manB. ten horsesC. a horseD. his engine10. The best title for this selection is .A. Watt's EngineB. The Origin of the Term HorsepowerC. Units of MeasurementD. It Happened 200 Y ears Ago参考答案：1-5 DBDAC 6-10 CDACB14：[论述题]15.请将下列汉语句子翻译成英文，要求内容忠实原文，语句通顺，逻辑清楚，表达正确。

1.一种操作系统可能比其他操作系统更适合某些计算任务。

2.用于计算编程的语言必须具有简单的逻辑结构，而且它们的语法、拼写和标点符号的规则必须精确。

3.编程语言可划分为低级语言和高级语言。

4.在机器语言中，指令被写成计算机能够直接理解的被称之为比特的1和0的序列。