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填空题答案:C联邦调查局的难题答案:这个助手将这份密函平端起来,凑近鼻子一端,闭上一只眼睛,斜斜地看图形,发现有“HELLO”的字样。
Fill in the blank answer: C FBI’s problem Answer: The assistant will be flat end of the secret letter, close to one end of the nose, close one eye, slanting to see the graphics and found “HELLO ” message.