题目

 菠菜浸泡在清水中，清水不变色；用开水浸泡菠菜后，水会变成绿色。这是因为开水伤了菠菜细胞的什么结构？   A．细胞膜     B．细胞壁      C．细胞质    D．细胞核 答案：A         Men usually want to have their own way. They want to think and act as they like. No one, however, can have his own way all the time. A man cannot live in society without considering the interests(利益) of others as well as his own interests. “Society” means a group of people with the same laws and the same way of life. People in society may make their own decisions, but these decisions ought not to be unjust(不公平) or harmful to others. One man’s decisions may so easily harm another person. For example, a motorist may be in a hurry to get to a friend’s house. He sets out, driving at full speed like a competitor in a motor race. There are other vehicles and also pedestrians (行人) on the road. Suddenly there is a crash. There are screams and confusion. One careless motorist has struck another car. The collision(碰撞) has injured two of the passengers and killed the third. Too many road accidents happen through the thoughtlessness of selfish drivers.          We have governments, the police and the law courts to prevent or to punish such criminal acts. But in addition, all men ought to observe certain rules of conduct. Every man ought to behave with consideration for other men. He ought not to steal, cheat, or destroy the property(财产) of others. There is no place of this sort of behavior in a civilized society. 51. A man cannot have his own way all the time because________. A. he may have no interest in other people B. he has to share the same interest with the people in the same society C. his decisions are always unjust            D. his decisions always harm other people 52. According to the passage, people in a civilized society should usually______. A. be honest to each other                         B. be cautions in doing everything C. behave in a responsible way                 D. punish criminal acts 53. The purpose of this passage is to_________. A. tell people how to behave in society   B. illustrate the importance of laws C. teach people how to prevent criminal acts D. persuade people not to make their own decisions 54. It is implied that there will be fewer road accidents if_______. A. the drivers are more considerate(体贴的) of other people B. there are fewer cars or walkers in the street C. the motorists are not always in a hurry D. the passengers are calm but not confused before the accidents 55. We can draw a conclusion that_______. A. the government should contribute more efforts B. the criminals should be more severely punished C. man should be more strict with himself D. man should have more and more similar interests