Organ Transplantations
     There were many horror stories in the 19th century about crazy (疯狂的) doctors who took a part of one
man's body and put it in that of another man's. The writers did not think it was possible, but in today's world
it is possible with some parts of the body-hearts, for example. But how far can this go in the future? Will
people be able to have new arms or legs, or even heads? It may not be crazy. We already have heart transplants
(移植), and artificial (人造的; 假的) arms, legs and hands. We have artificial muscles (肌肉) that use air to
move. We have computers which we put inside people to help make their bodies work. We can make artificial
ears, artificial eyes like small television cameras, and artificial throats, which make voices like the real thing. Mr.
White, a professor in a university in the United States says it will not be long before we have head transplants.
     "We can do this with the technology (技术) we have now. There is only one big problem-when we cut off
the old head, the nerves (神经) which join the rest of the body to the head is also cut and broken. The new head
could hear and see, but body could not move. But in the future, scientists will be able to make the head grow its
own nerves and join itself to the nerves in the body, like a plant grows into the soil."
     When will all this happen? In a few hundred years perhaps, says Professor White, who also says that his
ideas are as crazy as the ideas of the man who said a hundred years ago that it was possible to walk on the
moon.

1. The writers in the 19th century thought _____, so they wrote many horror stories.

A. it was fearful to have transplants
B. it was impossible to have transplants
C. some crazy doctors killed a lot of people
D. some crazy doctors injured a lot of people

2. Nowadays, the dream of transplanting some parts of a man's body _____.

A. has come true
B. is being studied by scientists
C. is being found out
D. hasn't been found out yet

3. With computers' help, _____.

A. scientists have had head transplants successfully
B. scientists can complete heart transplants and many other sophisticated (复杂的) operations.
C. scientists can easily complete head transplants
D. it will not be long before heart transplants can be done

4. It's difficult to have a head transplant nowadays because _____.

A. a new machine haven't been invented
B. nobody has done such an operation before
C. no doctor would do such a terrible operation
D. the way to connect the new head's nerves with the old body's has not been found out yet