根據(jù)下內(nèi)容，回答試題。

　　if you are writing or studying，it makes very much difference where We light comes form。People who use books and pens every day have to be especially careful about the way the light shines on their work.

　　Every house gets its light either from daylight through the windows-which is the best to use-or from lamps or electricity;but whichever kind of light it is，the way it shines toward our book or work is a matter of great importance to the eyes.

　　Take a book.sit with your back toward the window，and try to rea　　D.Your shadow(影子)falls all over the page and makes it almost as bad for your eyes as if you were in a dark room.

　　Now turn around and face the window.The page is in the shadow again，while the bright light is in your eyes..

　　Try sitting with your right side toward the window.This is very well for reading.but if you were writing.the shadow of your hand would fall across the page and bother(打攪)you a little.

　　There is just one other way：sit with your left side to the window.Now everything is perfect for reading and for writing，too.

　　Whatever kind of light is in the room，the rule about the right to sit is always the same.

　　第44題 Which of the following is true?

　　A.How the light shines on our work is of much importance.

　　B.The way the light shines on your work makes no difference.

　　C.We needn’t care about where the light comes from.

　　D.People Call write or study under a light that opines from any direction.

　　第45題 When you sit with your face towards the window，_____.

　　A.your shadow falls on your book B.Your book is in a shadow

　　C.the light is still dark　　D.the light is on y.our page

　　第46題 The best way both for reading and for writing is to_____.

　　A.sit facing the light B.let the light shine from your back

　　C.sit with your right side towards the light　　D.have the light come from your left

　　根據(jù)下內(nèi)容，回答試題。

　　Life gets noisier every day and very few people can free from noise of some sort or another.It doesn’t matter where you live-in the middle of a modem city。or a faraway village-the chances that you will be disturbed by jet aeroplanes，transistor radios，oil powered engines，et　　C.，are almost everywhere.We seem to be getting used to noise，t00.Some people feel quite lonely without back-ground music while they are working.

　　Scientific tests have shown that total silence can be very frightening experience for human beings.However，some people enjoy listening to pop music which is very loud，and this can do harm to their eardrums(耳鼓).The noise level in some disco is far above the usual safety level for heavy industrial areas.

　　One recent report about noise and concentration(專心)suggested that although a lot of people say that any noise disturbs their concentration，what really affects their ability to concentrate is a change in the level of noise：It goes on to say that a background noise，which doesn’t change too much(music，for example)may even help people to concentrate.

　　第47題 From this passage，the pollution of noise_____.

　　A.doesn’t matter much B.has become worse everywhere

　　C.has become better in big cities　　D.has become better in villages

　　第48題 “Background music”in the passage means_____.

　　A.music played in the concert B.a kind of noise coming into your ears

　　C.music which helps people to concentrate　　D.music played while people are working

　　第49題 Some people may have their hearing hurt_____.

　　A.while they are in complete silence B.while they are dancing violently

　　C.while they are listening to pop music　　D.while they are listening to soft music

　　第50題 Scientists have discovered that what prevents people from concentrating is_____。

　　A.any kind of noise B.great changes in level of noise　　C.background noise　　D.various background music