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 (濾除) .

  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主旨大意題。全文介紹了一項(xiàng)新科技產(chǎn)品，能讓患者聽音樂的同時(shí)不受牙醫(yī)電鉆的干擾，故答案為B項(xiàng)。

6. D詞義推斷題。由第2段第一、三句可知：我們最害怕聽到的聲音排名第一的就是牙醫(yī)的電鉆。一名患者說在看過牙醫(yī)后，他經(jīng)常夜里醒來腦袋里都是電鉆的可怕聲音。故答案為D 項(xiàng)，意為牙醫(yī)電鉆的聲音讓人毛骨悚然。

7. C細(xì)節(jié)理解題。由第四段第四句可知，電子濾波器過濾掉不必要的波聲。由后文可知，該設(shè)備在聲波振幅和頻率改變的情況下，依然可以過濾掉不必要的波聲，同時(shí)還能讓牙醫(yī)的聲音通過。故答案為C項(xiàng)。

A、D項(xiàng)與原文的表述矛盾，B項(xiàng)錯(cuò)誤在于把聲波轉(zhuǎn)換成數(shù)字信號(hào)的是麥克風(fēng)，而不是該設(shè)備。

8. B推理判斷題。由全文可知，該設(shè)備方便使用,使患者不受電鉆噪音的干擾，讓患者心情愉悅，故答案為B項(xiàng)。

題目來源：高考英語組合訓(xùn)練（完形填空 +閱讀理解） > 組合訓(xùn)練21-30

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