If you are writing or studying, it makes very much difference where the light comes from. People who use books and pens every da

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问题     If you are writing or studying, it makes very much difference where the light comes from. People who use books and pens every day  (41)  to be especially careful about the direction from which the light shines on their work.
    A house gets it’s light  (42)  from daylight through windows  (43)  is very good to use or from the lamps, but no matter what kind of light it is, the direction it slants(倾斜) towards our books or our work is a matter of great   44   to the eyes.
    Take a book,stand with your back toward the window, and try to read. Your shadow falls across the page and makes it bad for your eyes as if you were in a  (45)  room.
    Now turn  (46)   and face the window. The page is the shadow again,while the bright light is in your  (47)  . Try standing with your right side towards the window. This is very good for reading,  (48)  if you were writing,the shadow would  (49)  the page and trouble you a little.
    There is just one other way: stand with your  (50)  side to the window. Now everything is perfect for reading and for writing, too.

选项 A、but
B、or
C、so

答案A

解析 考查上下文关系。由句意可知,空格前后是明显的对立关系,冈此选表转折的but(然而,但是)。or表选择和让步,指“或者,否则”;so表示因果,指“因此”。
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