问题
单项选择题
一7，一5，一1，7，23，（）
A．55
B．49
C．36
D．30
答案
参考答案：A
解析：
解析：后一项与前一项的差依次为2，4，8，l6，故所求项为23+32=55。选A。
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一7，一5，一1，7，23，（）
A．55
B．49
C．36
D．30
参考答案：A
解析：
解析：后一项与前一项的差依次为2，4，8，l6，故所求项为23+32=55。选A。
A few minutes before six o’clock, Mr. Smith left the house. He just wanted to the car when a gunman (持枪者) jumped up from the back seat. He a gun to Mr. Smith’s head. “Drive me to Paris!” he shouted. “All right,” Mr. Smith answered. He started the engine (发动机), pulled away (开走) from the side of the street and down. Being 81 years old, he knew he could not fight with the gunman. He knew he needed help . Where were the police？ As he drove each crossing, he looked up and down the side streets, hoping to find a police car, but he could see . “Just my luck,” he thought. “If I were driving too , there would be a police car on every corner.” Suddenly he pushed his foot down on the accelerator (加速器), and the car went faster. “What are you doing？” shouted the gunman. “To the police,” Mr. Smith answered. “I thought I saw a police car near there.” He ran red lights, drove wrong on one-way streets. On the two-way streets, he drove on the wrong side of the road. None of the policemen saw him. Again, Mr. Smith’s plan was not working. He had to try a new plan. He turned at a corner and saw the in front. Then he drove his car as fast as he could towards the police gate. The car knocked a police motorbike over and stopped. Mr. Smith shouted, “Help! Help!” Then he back to grab (抓住) the man’s gun. At the same time the policemen heard the noise and quickly caught the gunman.
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