WHAT A B C D A B C D A B C D

25. What

A B C D

Many people still believe that natural resources will never be

used up. Actually, the world’s energy resources are limited.

No body knows exactly how much fuel is left. However, we

also should use them economically and try to find out

alternative sources of power. According to Professor Marvin

Burnham of the New England Institute of Technology, we

have to start conserving coal, oil and gas before it is too late;

and nuclear power is the only alternative.

However, many people do not approve of using nuclear

power because it is very dangerous. What would happen if

there were a serious nuclear accident? Radioactivity causes

cancer and may badly affect the future generations. The most

effective thing is that we should use natural resources as

economical as possible.