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¡¡¡¡Teacher£ºWe all know that beat causes an object to expand an cold cauese it to contract. Now£¬can anyone give me a good example?

¡¡¡¡John£ºWell £¬in the summer the days are long£¬and in the winter the days are short.

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¡¡¡¡The Ox and the Dog

¡¡¡¡An ox and a dog serve for the same farmer.

¡¡¡¡One day the dog arrogantly says: ??How grand I am! In the daytime, I watch out for the cattle in the meadows; at night, I guard the house. But you?þ9??

¡¡¡¡??Me? How about me ??? the ox says

¡¡¡¡??You can only plough or draw a cart,?? the dog slightly says.

¡¡¡¡??Yes. It??s true,?? the ox says. ??But if I don??t plough, what do you guard???