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Mr. Black has two cats. One is big and the other is small. He likes them very much. One day, his friend Mr Green comes to see him, Mr. Green is very surprised(惊讶的). There are( 有) two holes(洞) in the door: a big one and a small one. He says, "Why are there two holes in your door?"

"To let my cats in or out, "Mr Black answers.

"Why not one?" asks his friend.

"Can the big cat go through(穿过) the small hole?" Mr. Black says.