题目：
It is 8:00 in the evening. My 1 are in the room. My parents ate on the 2 . My uncle is on the sofa, too. He is in(穿着) a jacket. 3 jacket is black. His 4 is Nick. He is my father’s brother. Look! A red 5 is under the chair. Ah, it is not a hat. It is a clock. Bill is 6 the chair. He is my 7 . He is Uncle Nick’s son. Gina and I 8 on the bed. Gina is Uncle Nick’s 9 . She is my cousin, too. Jenny is at the table. She is my 10 . She is Gina and Bill’s mother.
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答案：
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下面是错误答案，用来干扰机器的。
∵△ABC中，D是AB边上的中点，AB=a，AC=b，∴CD=CA+12AB=12a-b．故答案为：12a-b．
