John Smith was a writer, who wrote detective stories for magazines（杂志）, though he never dealt with criminals（罪犯）. One evening he could not finish an end for a story. He sat in his study（书房）, but he had no ideas. So he decided to go to the cinema.
When he came back, he found that he had had a visitor. Someone had broken into his house. The visitor had had a drink, smoked several of his cigarettes and had read his story. The visitor left him a note. “I have read your story and I don’t think it is very good. Please read my suggestions and you can finish it. By the way, I am a thief. I’m not going to steal anything tonight. But if you become a successful writer, I will return.”
John read the thief’s suggestions. Then he sat down and wrote the rest of the story. He is still not a successful writer, and he is waiting for his “visitor” to return. Before he goes out in the evening, he always leaves a half-finished story in his study.
小题1:Detective stories are stories about_____.
A．science
B．children
C．the future
D．the police小题2:John went to the cinema because_____.
A．he was too tired
B．he wanted to look for a thief
C．he could not finish his story and hoped to get some ideas
D．he wanted to enjoy himself in the cinema小题3:The visitor came to John’s house in order to_____.
A．steal something
B．read the story
C．have a drink
D．visit the writer小题4:The visitor_____.
A．stayed in John’s house for a night
B．took some of John’s things away
C．left John some advice
D．was a good friend of John’s小题5:John would like to_____.
A．have a talk with his visitor
B．get more ideas from the visitor
C．make friends with the visitor
D．catch the visitor and take him to the police
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竖直方向升空的火箭上向后发出的光，对地速度一定比c小
竖直方向升空的火箭上沿水平方向发出的光对地速度为c 
竖直方向升空的火箭上向任一方向发出的光对地速度都为c