He taught them about the invention of farming and keeping animals.This was an important discovery,because by learning to cultivate (耕作)the land,and care for animals,mankind would always have food steadily available.It also meant that people could remain living in one place,and this made it easier to set about tasks that would take a long while to complete,like building towns,cities,and all that were in them.All the children were listening attracted by this story,until Lucy jumped up:

　　“And if that was so important and improved everything so much,why are we nomads all over again,Mr.Arnold?”

　　Mr.Arnold didn’t know what to say.Lucy was a very intelligent girl.He knew that she lived with her parents in a house,so she must know that her family were not nomads; so what did she mean?

　　“We have all become nomads again,” continued Lucy,“The other day,outside the city,they were cutting the forest down.A while ago a fisherman told me how they fish.It’s the same with everyone: when there’s no more forest left the foresters go elsewhere,and when the fish run out the fishermen move on.That’s what the nomads did,isn’t it?”

　　The teacher nodded,thoughtfully.Really,Lucy was right.Mankind had turned into nomads.Instead of looking after the land in a way that we could be sure it would keep supplying our needs,we kept developing it until the land was bare.And then off we would go to the next place! The class spent the rest of the afternoon talking about what they could do to show how to be more civilized.

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