Blood has a very short shelf life. Some blood components can be kept longer than others, for instance red blood cells will keep for 35 days but platelets(血小板)for only five. Remember, you should wait 16 weeks before donating blood again. 1. People should never worry about the donation mainly because________.

　　A. it causes no pain to their body

　　B. being a blood donor is a great honor

　　C. their body can produce new blood soon

　　D. the donated blood is the waste of their body

　　2. What component of blood is used to treat burned patients?

　　A. Plasma.

　　B. Red blood cell.

　　C. Platelet.

　　D. White blood cell.

　　3. We can learn from the passage that________.

　　A. whole blood is most widely used in hospital

　　B. whole blood can be kept for more than 10 days

　　C. people can donate their blood four times a year

　　D. people can donate about 470ml blood each time

　　4. Which of the following people can donate blood?

　　A. A teenager who is studying in a primary school.

　　B. A mother who is about to give birth to a new baby.

　　C. An adult who smokes and drinks from time to time.

　　D. A man just coming back from a place suffering malaria.

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