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 (鈴聲).It tells you that someone is calling you.Now,there is a ringtone called"mosquitotone (蚊子鈴聲)".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 (頻率).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 本文主要向我們介紹了蚊子鈴聲的起因,使用原理,及它的優(yōu)點和缺點.

解答 48 D 細節(jié)理解題:本文第二段倒數(shù)第二句為As we get older,we are unable to hear some sounds with high frequencies (頻率).,所表示的含義為隨著歲數(shù)的變大,我們不能夠聽到高頻率的聲音,故本題選D.
49 B 詞義理解題:本文第二段最后一句為As a result,a child or teenager can hear the mosquitotone ringtone,but it's_inaudible_to someone 20 or older.所表示的含義為兒童能聽到蚊子鈴聲,但是20歲以上就難以聽見,故本題選B.
50 D 細節(jié)理解題:本文第三段第二行有兩句為the student's phone rang.The 32yearold teacher looked at the student and became unhappy.所表示的含義為學(xué)生在課堂上使用手機,老師感到不開心,故本題選D.
51 C 細節(jié)理解題:本文最后一句話的含義為蚊子鈴聲有它的好處和不好的地方,故本題選C.

點評 首先對原文材料迅速瀏覽,掌握全文的主旨大意.因為閱讀理解題一般沒有標題,所以,速讀全文,抓住中心主旨很有必要,在速讀的過程中,應(yīng)盡可能多地捕獲信息材料. 其次,細讀題材,各個擊破.掌握全文的大意之后,細細閱讀每篇材料后的問題,弄清每題要求后,帶著問題,再回到原文中去尋找、捕獲有關(guān)信息. 要善于抓住每段的主題句,閱讀時,要有較強的針對性.對于捕獲到的信息,要做認真分析,仔細推敲,理解透徹,只有這樣,針對題目要求,才能做到穩(wěn)、準.

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