题目内容
The idea of giving blood is very simple, but that idea has saved many thousands of lives over the past century.
Doctors have been carrying out blood transfusions for hundreds of years. 1..起初,他们从绵羊身上抽血. But that wasn’t very successful. It wasn’t until last century that doctors realized there are several types of blood. 2.. and that the correct type must always be used. Once they knew that, blood transfusions had become almost 100% successful.
So, you might be thinking, what does this have to do with me? Well, 3..它与我们大家都有关系. Hospitals need to keep banks of blood ready for transfusions. The only way they can get that blood is from ordinary people like you. 4.. Every human body has about5.liters of blood, and we take 0.5 liters from each person. This is completely safe. In fact. 6.. your body will make enough blood to replace it in a day. It costs you nothing, and it could save a life. So please give blood.