閱讀理解

　　When you feel sad, tears will roll down your cheeks. When you are happy, especially when you laugh very hard, tears also will roll down your face. But tears have a more important job than showing how you feel.

　　Tears keep your eyes clean and healthy. They wash away dirt and germs 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. 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 are tiny sacks 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 them.

　　When you're 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
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 eyes must go into small holes in your lower eyelid

D．your eyes must open widely

答案：A;C;B;A;B
解析：

　　1．這篇文章就是要告訴我們?nèi)祟愒鯓右约盀槭裁戳餮蹨I．

　　2．從文章第二段前兩句中我們可以判斷出眼淚的主要功能．

　　3．除了高興和悲傷使人們流淚，風沙和灰塵也可以．

　　4．由第二段可知沒有眼淚的滋潤，眼球就不會轉(zhuǎn)動的那么靈活．

　　5．倒數(shù)第二段可知不斷眨眼就會流出眼淚．


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