题目

When you cut your skin, you bleed（流血）. If a person loses a lot of blood, he will become ill and may die．Blood is very important. People have always known that．At one time, some people even drank blood to make them strong! When doctors understand how blood goes around inside the body, they try ways of giving blood to people who need it. They take blood from the healthy people and give it to people who need it. This is called blood transfusion. The blood goes from the arm of the healthy person into the arm of the sick person. But there are two problems. First, it does not always wor下列属于遗传病的一组是（ ）A．侏儒症、乙肝 B．色盲、甲肝C．白化病、色盲 D．夜盲症、坏血病