题目内容
Crying babies,buzzing mosquitoes,ringing car alarms,they're all annoying noises. But what's the worst? A recent survey lists the things we hate to hear.
However,numberone on the list was the sound of a dentist's drill. "That lust sends shivers down my spine ," said one respondent. " After a visit to the dentist,I sometimes wake up at night with that sound in my head. It's horrible," said another. " I've seen patients shaking with fear when I bring out the drill," explained a dentist. Of course,anyone who has actually been to the dentist and heard the sound will probably agree with that.
But there's some good news,a new device developed by experts at College London,Brunei University and London South Bank University can cancel out the sound of the frightening drill. The tiny machine allows patients to listen to music on an MP3 player while the sound of the drill is eliminated. However,patients are still able to hear the dentist's voice because not all sounds are filtered out (滤除) .
The theory behind it is fairly straightforward. Microphones are placed close to the dental drill. These pick up any sounds and transform them into digital signals. Then,electronic filters cancel out any unwanted sound waves. This can be done even if the wave's amplitude (振幅) and frequency changes. However,the great thing is that this technology also allows other noises,such as the dentist's voice to come through.
It's easy to use,too. Patients simply plug the soundfiltering machine into their MP3 players. Then,via headphones,they can listen to music and hear the dentist's voice without being disturbed by the noise of the drill. Fantastic!
So,next time you go to the dentist,remember to bring your MP3 player.
( ) 5. What is the purpose of the text?
A. To announce a recent survey.
B. To introduce a new product.
C. To list some annoying noises.
D. To remind to bring your MP3.
( ) 6. What does the underlined sentence in Paragraph 2 most probably mean?
A. It makes me surprised. B. It makes me delightful.
C. It makes me wide awake. D. It makes me scared.
( ) 7. What technology is the tiny machine based on?
A. It can get rid of all the sounds.
B. It can transform sound waves into digital signals.
C. It can filter out the unwanted sounds.
D. It can change the sound wave's amplitude and frequency.
( ) 8. Which of the following words best describe the tiny machine?
A. Heavy and useless. B. Simple and practical.
C. Clear but frightening. D. Fantastic but noisy.
5. B主旨大意题。全文介绍了一项新科技产品,能让患者听音乐的同时不受牙医电钻的干扰,故答案为B项。
6. D词义推断题。由第2段第一、三句可知:我们最害怕听到的声音排名第一的就是牙医的电钻。一名患者说在看过牙医后,他经常夜里醒来脑袋里都是电钻的可怕声音。故答案为D 项,意为牙医电钻的声音让人毛骨悚然。
7. C细节理解题。由第四段第四句可知,电子滤波器过滤掉不必要的波声。由后文可知,该设备在声波振幅和频率改变的情况下,依然可以过滤掉不必要的波声,同时还能让牙医的声音通过。故答案为C项。
A、D项与原文的表述矛盾,B项错误在于把声波转换成数字信号的是麦克风,而不是该设备。
8. B推理判断题。由全文可知,该设备方便使用,使患者不受电钻噪音的干扰,让患者心情愉悦,故答案为B项。