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阅读理解。
William is playing with his friend in front of a house．An old woman walks up to him．“My boy，” she asks．“Is your mother at home?”
“Yes,” William says．The woman begins to ring the doorbell, but there is no answer．
She rings the doorbell again．There is still no an-swer．The old woman is not happy．She turns to Wil-liam and asks again， “Is your mother at home?” “Yes，she is，” William answers．“But I ring the doorbell twice and nobody comes to open the door，” the woman says．
“Oh，I'm sorry．This is not my house．My house is over there．”
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