First-time donors should be aged betweenand 65 ,weigh at least 50kg and be in good health.If you have donated before, you can start being a donor again up to yourth birthday.
Although most people are able to give blood,some people who pose health risks or are at a igher risk of having come into contact with an infectious disease are not asked to be donors.Pregnant women or those who have had a baby in the last9 months should not donate blood.
Blood has a very short shelf life.Some blood components can be kept longer than others, for instancered blood cells will keep for35 days but platelets (血小板) for only five.Remember, you should wait at leastweeks before donating blood again.
People should never worry about the donation mainly because .
t causes no pain to their body
B.eing a blood donor is a great honor
C.heir bodies can produce new blood soon
D.eople have a mature research on it
13.What component of blood is used to treat burned patients?
Plasma B.Red blood celC.Antibody D.White blood cel
14.We can learn from the passage that_________ .
A.whole blood is most widely used in hospital
latelets can be kept for more than10days
people can donate their blood four times a years
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