介绍:
What is it? it is a cat. what is it? it is a hat. the cat is in the hat. the cat is on the hat. what is it? it is a rat. the rat is on the cat. what is it? it is a mouse. what is it? it is a house. the mouse is in the house. the mouse is on the house. what is it? it is a dog. it is a log. the dog is on the log.
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