题目内容
of Nobel Prize winner Karl Landsteiner, the man who discovered the ABO blood group system. If you
have every thought of becoming a blood donor, just register to do it. And you should never worry about
the donation.
Just under a pint (around 470ml) of blood is taken at one sitting. This amount is no more than 13
percent of your total blood volume, and is quickly replaced by your body.
It may come as a surprise, but whole blood is only rarely used. Different blood components are used
to treat a range of conditions. None goes to waste. Red blood cells are frequently used to replace heavy
blood loss after an accident, surgery or childbirth. White blood cells and antibodies (抗体) are used to
help people fight infections if their immune system doesn't appear to be responding to antibiotics (抗生
素). Plasma (血浆), the straw-coloured fluid which carries the blood cells and contains proteins, are
used to treat burned patients.
First-time donors should be aged between 17 and 65, weigh at least 50kg and be in good health. If
you have donated before, you can start being a donor again up to your 70th birthday.
Although most people are able to give blood, some people who pose health risks or are at a higher
risk of having come into contact with an infectious disease are no tasked to be donors. Pregnant wo

or those who have h

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 at
least 16 weeks before donating blood again.
B. being a blood donor is a great honor
C. their bodies can produce new blood soon
D. people have a mature research on it
B. Red blood cell
C. Antibody
D. White blood cell
B. platelets can be kept for more than 10 days
C. people can donate their blood four times a years
D. people can donate at most 470 ml of blood each time
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 for a place suffering from malaria
B. To give people the knowledge of blood donation
C. To advise people to benefit from blood donation
D. To remind people of the importance of blood donation

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