| Signs can sometimes be seen at theentrance of a house, expressing that a tramp has passed. This specialsign language is frequently1 by tramps to inform their2whether the host of a certain house is friendly or unfriendly,and to3them the trouble of making unnecessary calls. Quite4one day, I came across a real tramp. He was such a rare sight these days that I stood some distance away and watched him He was dressed just as a tramp should be5, old worn trousers and a jacket many sizes too big for him. On his head there was a battered old hat and his boots were so old and worn-they were almost coming into6. But the man himself looked cheerful as if he had not a7in the world. He rubbed his nose with his forefinger,8a funny turn, laid a small parcel by the front gate, and began9a sign made by a former caller. Although the sign was meaningless to me, it must have been10, for the tramp's face lit up with11. He entered the front gate confidently and rang the bell. When the door opened, I saw him 12his hat but couldn't hear his words. The13was very short indeed, for no sooner had he spoken a few words than the door closed fiercely in his face. I felt14for him as he walked15 out of the house. But just as quickly, his face lit up again and he moved quickly towards the gate. There he stopped, looked at the sign, and16his head seriously as if he had made a bad mistake. 17deeply into his pockets, he produced a piece of chalk, rubbed out the18sign and made a new one in its place. He stared at it for a moment smiling to himself, then gathered his19,pushed back his hat and began walking towards the next house at an unhurried20whistling as he went along. | 
题目内容
（请给出正确答案）
简答题官方参考答案
（由简答题聘请的专业题库老师提供的解答）
