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问题 单项选择题

0ne of the limitations of foam as an extinguishing agent is that foam（）.

A.cannot be made with salt water

B.is heavierthan oil and sinks below its surface

C.is corrosive and to fire fighters

D.conducts electricity

答案

参考答案：D

阅读理解

阅读理解。

     In recent years doctors have been able to take parts from one human body and put them into another

human body. This has been called "transplanting (移植)". The parts of the body which are transplanted usually

come from the body of a person who has recently died. The most successful transplant has probably been the

transplant of the human eye. The most exciting transplant has been the transplant of a human heart from one

person to another. The human body often does not accept the new part completely. It often accepts it for a

short time but then refuses it. This means that the rest of the body will not work with the new part. The

person who has received the new part then dies.

1. Transplanting is usually carried out (实施) _____.

A. by two persons

B. by one person

C. between two persons

D. among many persons

2. The part to be transplanted is usually taken from somebody who is _____.

A. dying

B. healthy

C. ill

D. dead

3. Which part of human body is usually transplanted successfully?

A. The eye.

B. The human body.

C. The heart.

D. The leg.

4. The most exciting transplanting was the transplant of _____.

A. eyes

B. a heart

C. a hand

D. fingers

5. The person will _____ when his body refuses the transplanted heart.

A. live on

B. be comfortable

C. suffer (受苦) a great deal

D. lose his life

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多项选择题

人工燃气按制取方法可分为( )。

A．干馏燃气

B．裂化燃气

C．液化石油气

D．气化燃气
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