C
If you are writing or studyin9，it makes very much difference where the light comes from.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 i ts light either from daylight through the windows--which is the very 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 read.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 you fight 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(打搅)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 oi light is in the room，the rule about the right to sit is always the same.
第44题 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 can write or study under a light that comes from any direction.
答案：A
第45题 You shouldn't sit with your back towards the window because________.
A.the light is too dark
B.the light is bad for your eyes
C.you are in a dark room
D.your book is in your shadow
答案：D
第46题 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 your page
答案：B
第47题 The best way both for reading and for writing is to________.
A.sit facing the light
B.1et the light shine from your back
C.sit with your right side towards the light
D.have the light come from your left
答案：D
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