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

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、want
B、have
C、know
答案B
解析 考查动词用法。want想要；know知道；have to必须。填入[A]、[C]两项语法虽正确，但意思不符合逻辑。have to实际上是一个情态动词，用在此处含有警告或者忠告的意味。
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