第3部分：概括大意与完成句子 （第23～30题，第题1分，共8分）
下面这篇短文后有2项测试任务：（1）第23～26题要求从所给的6个选取项中为第2～5段选择1个正确的小标题；（2）第27～30题材要求从所给的6个选项中选择4个正确选项，分别完成每个句子。请将答案涂在答题卡相应的位置上。
1. Children enjoy shouting at a high wall and hearing the sound come back to them. These sounds are called echoes （回声）. Echoes have given us a number of valuable tools.
2. Echo sounding devices were early used in making maps of the ocean floor. Sounds or ultrasonic （超声的） sounds make good tools for determining how deep the water is under ships. Sometimes echoes from ultrasonic distance finding devices were prevented from working by fish swimming past or by the presence of large objects. So ultrasonic devices have been replaced by other tools.
3. Radar is now a familiar tool. Like many others it was an unexpected discovery. It was first observed by two researchers, who were studying sound communication. They were sending signals from a station on one side of a river in Washington,
D IC. to a vehicle across the river. They discovered that their signals were stopped by passing ships. They recognized the importance of this discovery at once.
4. All this was of course just a start, from which our present radar has developed. The word "radar," in fact, gets its name from the term "radio detection （检测） and ranging." "Ranging" is the term for detection of the distance between an object and the radar set. Today, in our scientific age, it would be difficult to manage without radar.
5. One of the many uses of radar is as a speed control device on highways. When a person in an automobile is driving faster than the speed limit, radar will show this clearly and the traffic police can take measures to stop him.
6. A pilot cannot fly a plane by sight alone. Many conditions such as flying at night and landing in dense fog require the pilot to use radar. Human eyes are not very good at determining speeds of approaching objects, but radar can show the pilot how fast nearby planes are moving.
23 Paragraph 2 .
24 Paragraph 3 .
25 Paragraph 4 .
26 Paragraph 5 .
A Study of Sound
B Highway Police
C Working Principles
D Early Use of "Radar"
E Useful Tools
F Discovery by Chance
27 Echo-sounding devices were early used to .
28 Ultrasonic device were used to .
29 Police use radar on highways to .
30 Radar helps pilots to .
A detect nearby objects
B determine the depth of the ocean water
C decide how fast you drive
D stop passing ships
E map the ocean floor
F observe water flow
第4部分：阅读理解（第31～45题，每题3分，共45分）
下面有３篇短文，每篇幅短文后有5道题，每题材后面有4个选项。请仔细阅读短文并根据短文回答其后面的问题，从4个选项中选择一个最佳答案涂在答题卡相应的位置上。
第一篇 Denny
His nickname is Denny. He weighs 400 pounds; he is fearless and he never goes to sleep on the job. An ideal security guard? For many situations he may be. And if he's so good that you wish you had a dozen like him, just place your order. Denny is a robot guard.
Denny can detect, within a 150-foot radius, the presence of anything or anybody that shouldn't be there. Its swiveling （旋转） head contains microwave and infrared sensors that can detect people as well as smoke. In future editions the head will also contain sensors that can smell the weak smell of a human body.
A high-resolution TV camera in Denny's head is on at all time. When something unexpected comes into view, the TV transmitter switches on. Thus the human overseer （看管人） in the control center sees the sudden appearance of a picture on the monitor screen. At the same time the picture is automatically videotaped.
Normal speed of the robot guards is about one mile an hour, and they can even talk: 'you have been detected,' warns the voice from the clever guard. Denny is designed to patrol corridors and other areas after lock-down hours （of course, he can work round the clock when necessary）, not to move among people. If, say, a prisoner does get near the corridor where he should not be, it'll immediately tell its base station by radio.
Denny has understandable limitations. He can't open doors or watch stairs, for example, or distinguish friend from enemy. Thus he will have to go about unarmed. And he won't be able to replace human security guards where people move about freely.
31 Denny is a robot guard, who
A has mechanical anus and legs.
B has microwave and infrared sensors.
C has a built-in computer.
D depends on his built-in radio for distinguishing a friend from an enemy.
32 Which of the following pieces of equipment is NOT mentioned as part of the robot according to the passages?
A The TV camera.
B The radio transmitter, C The infrared sensor,
D The audio tape-recorder.
33 Which of the following statements is true?
A Only strong smell can be detected by Denny.
B Denny is able to replace human security guards where people move about freely.
C A high-resolution IV camera in Denny's head is on and off automatically.
D Denny cannot open doors or watch stairs.
34 Why does Denny have to go unarmed?
A He cannot tell an enemy from a friend.
B The price would be very high if it were armed,
C He does not know how to use a weapon.
D It is unlikely that he will be attacked by a human enemy.
35 After reading this passages you probably have got the impression that
A Denny moves quite fast.
B Denny moves both in corridors and up and down stairs.
C Denny's voice warns at regular intervals while patrolling.
D Denny moves quite slowly.
