题目列表(包括答案和解析)
| A.植物的光合作用和呼吸作用 | B.植物的分泌物有杀菌作用 |
| C.植物的光合作用和蒸腾作用 | D.茂盛的林木遮住了大部分太阳光 |
Tears keep your eyes clean and healthy. They washed away dirt(灰尘)and germs(细菌)and other things that get in your eyes. Your eyes also need tears to keep them wet. Your eyes must be wet so that they can move smoothly(光滑的). Your eyes are busy looking here and there all day long. They move quickly from one thing to another. If you didn't have tears, your eyes couldn't move, and soon you would be blind.
But where do these tears come from?
Under each eyelid(眼睑)are tiny sacs called tear glands. That's where tears are made. Every time you blink your eyes. Some tears are pushed out of these glands. The tears wash over your eyes and soothe(滋润)them.
When you are not laughing or crying your tears away, where do they go? They go away through small holes in your lower eyelid. Some of these holes lead into your nose. Many times when you cry, the tears drip down through your nose—and it starts to run. The drops that fall from your nose are your tears.
Maybe you don't like baths, but your eyes can't do without them.
1. This story tells us ________.
A. how and why people have tears
B. why people cry when they are happy
C. what makes people sad
D. why people cry when they are unhappy
2. Tears help you by ________.
A. filling up your tear glands
B. washing your cheeks and nose
C. washing things from your eyes
D. showing how you feel
3. You probably get extra tears in your eyes when ________.
A. it is dark and rainy
B. it is dusty and windy
C. it is hot and damp(潮湿的)
D. it is cold
4. If your eyes were not wet, you could not ________.
A. look at things as quickly
B. see without your glasses
C. show people what you think
D. laugh or cry
5. If your eyes need to be soothed, the first thing that must happen is ________.
A. your nose must start to run
B. your eyes must blink to make tears
C. your tears must go into small holes in your lower eyelid
D. your eyes must open widely
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