题目：
| 完形填空。 | ||||
| Tolstoy, the great Russian writer, liked to walk about in a railway station near his home. One day when he was walking up and down as 1 , looking at people getting on and off the 2 , he heard a lady 3 after him, "Hey, you old fellow, go and bring back my handbag in the 4 room which I 5 there." Tolstoy 6 there. He 7 the bag up and walked quickly along the platform. At the same time the lady was waiting beside the carriage, looking 8 . When at last the old man gave the bag back to her, she opened it to 9 sure nothing was 10 .""Good, old man." said the woman. "You are just as quick as I can expect. Here you are."She gave a copper coin to him. Tolstoy 11 the coin and put it into his pocket with a smile. But the woman was very 12 when she heard he was Tolstoy, the author of the great novel WAR AND PEACE. She returned to Tolstoy and said,"Oh, excuse me... Oh, how silly I was to 13 you as a porter. Please throw back that coin if you forgive me." "Oh, madam, why? You have done 14 wrong." Tolstoy laughed."The coin is given for my work, so I 'll 15 it. Thank you, madam!" | ||||
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答案：
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C 题目分析：设斜面的倾角为θ．对于图甲，以A为研究对象，分析其受力如图1，根据平衡条件得：（mg+F）sinθ=μ（mg+F）cosθ，得到μ=tanθ；对于乙图，以B为研究对象，分析其受力如图2，设地面对B的摩擦力方向...
