1970 was World Conservation Year. The United Nations wanted everyone to know that the world is in danger. They hoped that governments would act quickly in order to ‘conserve’ nature. Here is one example of the problem. At one time there were 1,300 different plants, trees and flowers in Holland, but now only 866 remain. The others have been destroyed by modern man and his technology. We are changing the earth, the air and water. We can’t live without these things either. If we continue like this, we shall destroy ourselves.

(91 words)

　　What is mainly discussed in the paragraph?
　　 A) Changes of the world.　　　
　　 B) The United Nations.　　　　　
　　 C) Plants in Holland.　　　　
　　 D) Nature Conservation.　　　

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