Question

【题目】

The Blood Group Alphabet

Sometimes people lose too much blood from injuries or accidents. To save their lives, doctors must replace the lost blood. In an operation called a transfusion, doctors put blood given by healthy people into the veins（静脉）of the sick or injured person. But they must be careful. Although all blood looks the same, there are really different types of blood. Someone getting the wrong type of blood in a transfusion may become very sick or even die.

All blood is made up of red and white cells, and a liquid（液体）called plasma（血浆）. It is the red cells that cause blood to be different types. On the outside of the red cells of some people's blood are proteins（蛋白质）. Doctors group these proteins into two different classes, A and B. People with the A protein have Type A blood, while people with the B protein have B type blood. If someone happens to have both proteins, that person has Type AB blood. Some people don't have either protein, and their blood is called Type O.

If a person receives a transfusion of the wrong type of blood, the body senses the strange protein on the new blood cells. So the body destroys the new blood, and the patient goes into shock. For example, people with Type A blood will become very sick if they are given Type B protein because their bodies try to destroy the strange Type B protein. People with Type O blood have no proteins on their cells, so their bodies will destroy both Type A and Type B blood. They can only receive Type O blood. But people with Type AB blood have both proteins, so they can receive Type A, Type B and Type AB blood. These people are called Universal Receivers. People of any type can receive Type O blood because it has no protein for the body to fight against. So Type O people are called Universal Donors.

Doctors are always careful to test blood for its type before it is used in a transfusion. Although the wrong type of blood can be harmful, the right type can save a life.

【1】What is the blood made up of?

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【2】How many classes do doctors group the proteins into?

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【3】What type of blood does the person have if someone doesn't have either protein?

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【4】Why can people with Type O blood only receive Type O blood?

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【5】Are Type AB people called Universal Donors?

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Answer 1

【答案】

【1】It is made up of red and white cells, and plasma.

【2】2.／Two.

【3】Type O.

【4】Because they have no proteins on their cells, so their bodies will destroy both Type A and Type B blood.

【5】No.／No, they aren't.

【解析】

本文介绍了不同的血型以及解释了为什么输血没有对准血型的话病人会更严重甚至死亡。

【1】根据“All blood is made up of red and white cells, and a liquid called plasma”，可知，血液是由红细胞，白细胞和血浆组合而成。故答案为It is made up of red and white cells, and plasma。

【2】根据“Doctors group these proteins into two different classes, A and B”可知，医生将这些蛋白质分为两类，A类和B类。故答案为Two。

【3】根据“Some people don't have either protein, and their blood is called Type O”可知，一些人两种蛋白质都没有的，他们的血型叫O型血。故答案为Type O。

【4】根据“People with Type O blood have no proteins on their cells, so their bodies will destroy both Type A and Type B blood, They can only receive Type O blood”可知，O型血的人细胞上没有蛋白质，所以他们的身体将会破坏A型血和B型血，他们只能接受O型血。故答案为Because they have no proteins on their cells, so their bodies will destroy both Type A and Type B blood。

【5】根据“But people with Type AB blood have both proteins, so they can receive Type A, Type B and Type AB blood. These people are called Universal Receivers”可知，AB型血的人被称作通用接受者。故答案为No, they aren’t。