閱讀理解。
                                                   Blood Donation (獻血)
     A grown-up person has ten or eleven pints (品脫) of blood inside his or her body. We can lose a pint of
blood without feeling, but if we lose too much blood, we feel weak and cold. Our faces become pale. We may
die. This is what often happen when somebody is hurt in an accident, or a soldier is hurt in a war. 1______
But today they can be taken to hospital and given more blood. Almost at once they feel better. their faces are
no longer pale. They do not die. 
     2______ People may donate blood to a blood bank so that it can be used to save people's lives. When they
go to donate blood, a special kind of needle(針) is put into the arm. It does not hurt. The blood runs through
the needle and through a rubber tube (橡膠管) into a bottle or a bag. A pint of blood is taken in this way. The
person who has given blood drinks a cup of tea of coffee and rests for a few minutes, then he feels well.
3______ 
     A person who gives blood feels happy, because he knows that his blood will be used to someone's life.
4______    
     When you are older, you may give blood, too. But you can't do this until you are eighteen.
A. And he may give his blood like this three months later.
B. Where does this blood come from?
C. Perhaps one day he himself will need blood.
D. Many people used to die in this way.
5. A person who gives blood feels happy, because ______.
A. he knows his blood maybe save someone's life.
B. he gets a lot of money.
C. He knows that his blood is very good.
D. He can drink a cup of tea or coffee and rests.
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