If you are writing or studying, it makes much difference where the light comes from. People use  36  and pens every day. They have to be very careful about the  37  of the light because the light shines on their work.
Every  38  gets its light either from daylight  39  the window or from the lamps,   40  no matter what kind of light it is, the way it shines is very important to the eyes.
Take a book and sit with your  41  towards the window, and try to read. Your shadow(影子) falls all over the page and makes it  4  for your eyes as if you were in a  43  room. Now turn around and face the window. The page is in shadow again,  44  the bright light is in your eyes.Try sitting with your  45  side towards the window. This is very good for reading, but if you were writing, the shadow  46  fall across the page and trouble you  47 .There is another way – sit  48  your left side to the window. Now everything is perfect for  49   as well.
Whatever kind of light is in the room, the rule about the right way to sit is  50  the same. So you see different ways to sit make much difference in writing or studying.
【小题1】.

缺词填空  先通读下列短文，掌握其大意，然后根据短文内容和所给首字母，在空格内填入一个适当的词，使短文意思完整。所填单词在题后横线上必须完整写出（本大题共6分，每格0.5分）

Suppose you are reading a book. Suppose you suddenly close your eyes, can you still see the book? "Of course not." you will say. But can you tell why? You would p__1. say, "When I close my eyes, my e__2.___ cannot get out of my eyes to get to the book." Many others might give an explanation(解释) very much like the above . But this explanation is w__3.___.

      You cannot see any object if light from that object doesn’t get into your eyes. Some of the things you see give off light of their own.

      The sun, the star, a lighted lamp are examples that can be seen by their own light. S__4.__ things are luminous(发光的). Most of the things you see are not giving off light of their own. They are simply reflecting(反射) light that falls on them from the sun or some other luminous bodies. The moon, for example, doesn't give off any light of i__5._ own. It's non-luminous. You see it because sunlight falls on it and some of it reflects in your d__6.__. So moonlight is only second-hand sunlight.

      When you look at a book, it sends to your eyes some of the light which falls on it, and you see the book. If light could be kept out from w__7.__ you are, so that there would be no light for the book to reflect, then you could not see the book e__8.__ with your eyes wide open.

      Light travels so fast that the time it t___9.__ from the book to your eyes is so s___10._ as if there was none at all. Light r___11.__ us from the moon, which is about 380,000 kilometers away, in only a little more than a s__12.__.

John is a famous writer now.But he said he was not a   【小题1】  student when he was young.He was often late for    【小题2】  and didn’t like doing his homework.
Sometimes, he slept in class while the teacher was teaching.He didn’t understand much,   【小题3】 he always thought he understood everything.One day the teacher 【小题4】  the students a question, ‘When Jack was ten years old,  【小题5】 brother Bob was twenty.Jack is fifteen now and   【小题6】  is his brother Bob?’ John said, ‘ That’s easy.Bob is twice as old as Jack.So he is now thirty.’
Another time, the   【小题7】  in a science class asked, ‘ When it thunders（打雷）,   【小题8】  do we always see the light before we   【小题9】  the sound?’ ‘But, Miss,’ said John quickly.‘ Don’t you    【小题10】 our eyes are in front of our ears?’