15.Whats the difference between man and other living things according to the passage?

　　16.What does the passage mainly want to tell us?

　　Passage Three

　　Many large cities are anything but beautiful

　　Streets are littered with trash.

　　In this trash, however, there is still something that can be useful.

　　If people want to solve the problem of waste

　　there is no time to be lost.

　　They must work out ways of making use of good things which are just thrown away as waste.

　　When a car gets too old,it may not run any more.

　　But the metal that the car was made of is still good.

　　It can be put to use again.

　　When a bottle is empty, it goes out in the trash.

　　Garbage from food can be changed into fertilizer.

　　But bottle glass can be ground into sand and used to pave street.

　　But first you have to fish out all the glass and metal.

　　Garbage can also be a good source for making building block

　　which are then covered with concrete.

　　Now,more and more machines are designed for this purpose.

　　Some day,people will watch films in a magnificent cinema which has been built out of garbage.

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