A blood transfusion is a way of giving one person's blood to another person who

A blood transfusion is a way of giving one person's blood to another person who needs it. When you need blood, you have a big problem because your body won't work right without enough healthy blood. Your heart pumps blood through blood vessels that reach very organ and tissue（组织）in the body. One of the blood's most important jobs is to deliver oxygen to each cell in the body. Without oxygen, the body can't live.

Blood transfusions are possible because volunteers donate their blood. That is why hospitals have blood to give to others. It may sound creepy to donate blood, but it's safe and it's no big deal for a healthy person to donate a small amount--usually 473 milliliters. Your mom or dad might have done this. Kids don's usually donate blood, but it's a good thing to do for older teens. A person usually must be 17 to donate blood.

Healthy donated blood is very valuable. They even call the place that collects it the blood bank. Do you understand why? A bank is a safe place for money and other valuables.

People who have certain illnesses such as hepatitis（肝炎）or HIV aren't allowed to donate blood, because they could pass their sickness on to another person through a blood transfusion. After the blood is collected, blood banks test it very carefully to make sure that the blood is free of diseases and germs. The blood bank won't use any blood that could make someone sick.

Blood banks are also very careful not to get things like dirty. People who collect the blood are sure to use a new needle and fresh collection equipment for every donor. That way, even if someone's blood was infected, it can't be spread to other people or contaminate Other healthy blood at the blood bank. Blood is used just once. If there is any leftover it is thrown away.

(1)Which of the statements is NOT true according to the passage?

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A．Delivering oxygen to the body's cells is one of the blood's most important jobs.

B．Donated blood is probably the most important source of blood for transfusions.

C．Donating blood is not harmful to a healthy person.

D．It's not good for a person under 17 to donate blood.

(2)People call the place that collects blood a blood bank to show that ______.

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A．a bank is a safe place

B．donated blood is as important as a bank

C．donated blood is very valuable

D．a bank is the safest place to keep blood

(3)Which of the following is the best title?

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A．Blood Transfusions Are Important

B．What Is a Blood Transfusion?

C．What Is a Blood Bank?

D．Donated Blood Is Valuable

试题答案

答案：C;C;B