A、She is happy to clean windows. B、She loves to clean used windows. C、She is fond of clean used windows. D、She likes clean windo

All her life, my mother wanted busy children. It was very important that her house should remain at all times clean and tidy.
    You could turn your back for a moment in my mother’s house, leave a half-written letter on the dining room table, a magazine open on the chair, and turn around to find that my mother had " put it back where it belonged" as she explained.
    My wife, on one of her first visits to my mother’s house, placed a packet of biscuits on an end table and went to the kitchen to fetch a drink. When she returned, she found the packet had been removed. Confused, she set down her drink and went back to the kitchen for more biscuits, only to return to find that her drink had disappeared.
    These disappearances had a confusing effect on our family. We all tended to be forgetful, and it was common for one of us, upon returning from the bathroom, to find that every sign of his work in progress had disappeared suddenly. "Do you remember what I was doing?" was a question frequently asked, but rarely answered.
    Now my sister has developed a second-hand love of clean windows, and my brother does the cleaning in his house. I try not to think about it too much, but I have at this later time started to dust the furniture once a week.
    We all have become busy persons.
Questions 13 to 15 are based on the passage you have just heard.
13. What is my mother like?
14. What kind of person is my sister now?
15. What is the passage mainly talking about?