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56. Most of the astronauts were unwilling to go on a trip because _______. A. there was little chance of being selected B. they weren’t experienced enough C. they thought they might get killed D. it wasn’t exciting enough 57. Why were Sam and Joe chosen? A. The boss wanted them to get more experience. B. The boss trusted them more than anyone else. C. They were the last people who wanted to go. D. They were the only men who offered to go. 58 Joe didn’t want to work with Sam again probably because he thought Sam _______. k+s-5#u A. was very slow and possibly deaf B. didn’t know how to operate the door C. was less experienced than he was D. didn’t know how to do repairs 59. The writer tells this story to _______. A. show the dangerous side of the astronauts’ life B. make people laugh C. show the funny side of the astronauts’ life D. make people think B The fiddler crab (蟹) is a living clock. It indicates the time of day by the colour of its skin, which is dark by day and pale by night. The crab’s changing colour follows a regular twenty-four hour plan that exactly matches the daily rhythm of the sun. Does the crab actually keep time, or does its skin simply answer to the sun’s rays, changing colour according to the amount of light which strikes it? To find out, biologists kept crabs in a dark room for two months. Even without daylight, the crab’s skin colour continued to change exactly on time. This characteristic probably developed gradually in answer to the daily rising and setting of the sun, to help protect the crab from sunlight and enemies. After millions of years it has become completely controlled inside the living body of the crab. The biologists noticed that once each day the colour of the fiddler crab is especially dark, and that each day this happens fifty minutes later than on the day before. From this they discovered that each crab follows not only the rhythm of the sun but also that of the tides (潮水). The crab’s period of greatest darkening is exactly the time of low tide on the beach where it was caught! 60. The crab’s changing colour _______. A. tells the crab what time it is B. protects the crab from the sunlight and enemies C. keeps the crab warm D. is of no real use 61. When the fiddler crabs were kept in the dark, they _______. A. did not change colour B. changed colour more quickly C. changed colour more slowly D. changed colour on the same timetable 62. The crab’s colour—changing ability was probably developed _______. A. in the process of evolution (进化) B. over millions of years C. by the work of biologists D. both A and B k+s-5#u 63. The best title for this selection would be _______. A. The Sun and the Tides B. Discoveries in Biology C. A scientific Study D. A Living Clock C Hank Viscardi was born without legs. He had no legs but stumps(残肢) that could be fitted with a kind of special boots. People stared at him with cruel interest. Children laughed at him and called him ‘Ape Man’ because his arms practically dragged on the ground. Hank went to school like other boys. His grades were good and he needed only eight years to finish his schooling instead of the usual twelve. After graduating from school, he worked his way through college. He swept floors, waited on table, or worked in one of the college offices. During all this busy life, he had been moving around on his stumps. But one day the doctor told him even the stumps were not going to last much longer. He would soon have to use a wheel chair. Hank felt himself got cold all over. However, the doctor said there was a chance that he could be fitted with artificial legs(假腿). Finally a leg maker was found and the day came when Hank stood up before the mirror. For the first time he saw himself as he has always wanted to be--- a full five feet eight inches tall. By this time he was already 26 years old. Hank had to learn to use his new legs. Again and again he marched the length of the room, and marched back again. There were times when he fell down on the floor, but he pulled himself up and went back to the endless marching. He went out on the street. He climbed stairs and learned to dance. He built a boat and learned to sail it. When World War II came, he talked the Red Cross into giving him a job. He took the regular training. He marched and drilled along with the other soldiers. Few knew that he was legless. This was the true story of Hank Viscardi, a man without legs. (责任编辑：admin) |