题目

如图,在中,,,把边翻折,使边落在边上,点落在点处,折痕为, 则的值为(    ) (A)               (B)       (C)          (D)   答案:DLiving with his daughter is a great ________ for the old man. [     ]A. comfort  B. relieveC. relaxation  D. behavior
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