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20.In many high schools,there are strict rules about using mobile phones.If your phone rings in class,for example,the teacher will be very angry.
Every mobile phone has a ringtone (铃声).It tells you that someone is calling you.Now,there is a ringtone called"mosquitotone (蚊子铃声)".Using it,students can receive calls and text messages (短信) in class but the teacher will not realize what is happening.How?
Mosquitotone has a special sound.Only children and teenagers can hear it.As we get older,we are unable to hear some sounds with high frequencies (频率).As a result,a child or teenager can hear the mosquitotone ringtone,but it's_inaudible_to  someone 20or older.
But sometimes,people over 20can hear the ringtone.One British student's phone uses mosquitotone.In class,the student's phone rang.The 32yearold teacher looked at the student and became unhappy."I heard that.You know the rule:no mobile phone in class."
Not all the students are interested in mosquitotone.Jerry Jones,a high school student of 17,says,"Using mosquitotone too often is bad for our hearing.I may use it for pleasure,but not in class.It's unfair to the teachers!"
What do parents think of mosquitotone?"I think it is perfect for places like movie theaters,"says Connie Neeson,44."Think about it.Yon're watching a film and someone's mobile phone rings.Mosquitotone is good because many people don't hear it.However,it also has a bad influence on their study if students use it in class."

48.Mosquitotone works becauseD.
A.it is very loud                    B.it has no sound
C.it has a beautiful sound           D.it uses high frequencies
49.The under lined part"it's_inaudible_to"means"B".
A.it can't be seen by                B.it can't be heard by
C.it isn't popular with              D.it isn't healthy for
50.The 32yearold teacher felt unhappy because the studentD.
A.was late for class B.didn't do his homework
C.couldn't answer her question D.was using a mobile phone in class
51.Connie Neeson thinks that mosquitotoneC.
A.has no bad influence                B.is unfair to the teachers
C.has its advantage and disadvantage  D.can't be used in any public place.

分析 本文主要向我们介绍了蚊子铃声的起因,使用原理,及它的优点和缺点.

解答 48 D 细节理解题:本文第二段倒数第二句为As we get older,we are unable to hear some sounds with high frequencies (频率).,所表示的含义为随着岁数的变大,我们不能够听到高频率的声音,故本题选D.
49 B 词义理解题:本文第二段最后一句为As a result,a child or teenager can hear the mosquitotone ringtone,but it's_inaudible_to someone 20 or older.所表示的含义为儿童能听到蚊子铃声,但是20岁以上就难以听见,故本题选B.
50 D 细节理解题:本文第三段第二行有两句为the student's phone rang.The 32yearold teacher looked at the student and became unhappy.所表示的含义为学生在课堂上使用手机,老师感到不开心,故本题选D.
51 C 细节理解题:本文最后一句话的含义为蚊子铃声有它的好处和不好的地方,故本题选C.

点评 首先对原文材料迅速浏览,掌握全文的主旨大意.因为阅读理解题一般没有标题,所以,速读全文,抓住中心主旨很有必要,在速读的过程中,应尽可能多地捕获信息材料. 其次,细读题材,各个击破.掌握全文的大意之后,细细阅读每篇材料后的问题,弄清每题要求后,带着问题,再回到原文中去寻找、捕获有关信息. 要善于抓住每段的主题句,阅读时,要有较强的针对性.对于捕获到的信息,要做认真分析,仔细推敲,理解透彻,只有这样,针对题目要求,才能做到稳、准.

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