[单项选择]
Passage One

Astronaut Jim Voss has enjoyed many memorable moments in his career, including three space flights and one space walk. But he recalls with special fondness a decidedly earthbound (为地球吸引所束缚的) experience in the summer of 1980, when he participated in the NASA-ASEE Summer Faculty Fellowship Program. Voss then a science teacher at West Point, was assigned to the Marshall Space Flight Center’s propulsion (推进) lab in Alabama to analyze why a hydraulic fuel pump on the space shuttle was working so well when previous seals had failed. It was a seemingly tiny problem among the vast complexities of running the space program. Yet it was important to NASA because any crack in the seal could have led to destructive results for the astronauts who relied on them. "I worked a bit with NASA engineers," says Vo A. Because previous seals all failed. B. Because it was very complex in running the space program. C. Because great care has to be taken of the hydraulic fuel pump sealing. D. Because any crack in the seals would cause disastrous results for the astronauts. 查看答案 更多"Passage One Astronaut Jim"的相关试题: [单项选择] Passage One Astronaut Jim Voss has enjoyed many memorable moments in his career, including three space flights and one space walk. But he recalls with special fondness a decidedly earthbound (为地球吸引所束缚的) experience in the summer of 1980, when he participated in the NASA-ASEE Summer Faculty Fellowship Program. Voss then a science teacher at West Point, was assigned to the Marshall Space Flight Center’s propulsion (推进) lab in Alabama to analyze why a hydraulic fuel pump on the space shuttle was working so well when previous seals had failed. It was a seemingly tiny problem among the vast complexities of running the space program. Yet it was important to NASA because any crack in the seal could have led to destructive results for the astronauts who relied on them. "I worked a bit with NASA engineers," says Vo A. Ⅰ only. B. Ⅱ only. C. Ⅰ, Ⅱ and Ⅲ all included. D. Ⅰ and Ⅱ only. 查看答案 [单项选择]Passge Three Astronaut Jim Voss has enjoyed many memorable moments in his career, including three space flights and one space walk. But he recalls with special fondness a decidedly earthbound(只在地球上的) experience in the summer of 1980 when he participated in the NASA-ASEE Summer Faculty Fellowship Program. Voss, then a science teacher at West Point was assigned to the Marshall Space Flight Center’s propulsion(推进) lab in Alabama to analyze why a hydraulic fuel pump seal on the space shuttle was working so well when previous seals had failed. It was a seemingly tiny problem among the vast complexities of running the space program` Yet it was important to NASA because any crack in the seal could have led to destructive results for the astronauts who relied on them. "I worked abit with NASA engineers, "says Voss, "but I did it mostly by analys A. Because previous seals all failed. B. Because it was very complex in running the space program. C. Because great care has to be taken of the hydraulic fuel pump sealing. D. Because any crack in the seals would cause disastrous results for astronauts. 查看答案 [单项选择]Astronaut Jim Voss has enjoyed many memorable moments in his career, including three space flights and one space walk. But he recalls with special fondness a decidedly earthbound(只在地球上的) experience in the summer of 1980 when he participated in the NASA-ASEE Summer Faculty Fellowship Program. Voss, then a science teacher at West Point was assigned to the Marshall Space Flight Center’s propulsion(推进) lab in Alabama to analyze why a hydraulic fuel pump seal on the space shuttle was working so well when previous seals had failed. It was a seemingly tiny problem among the vast complexities of running the space program` Yet it was important to NASA because any crack in the seal could have led to destructive results for the astronauts who relied on them. "I worked abit with NASA engineers, "says Voss, "but I did it mostly by analysis. I used a handheld calculator, not a computer, to do a thermodynamic(热力学的) analysis. "At the end of the summer, he, like the other NASA-ASEE fellows wor A. Because previous seals all failed. B. Because it was very complex in running the space program. C. Because great care has to be taken of the hydraulic fuel pump sealing. D. Because any crack in the seals would cause disastrous results for astronauts. 查看答案 [单项选择]Passage 2 Another thing an astronaut has to learn about is eating in space. Food is weightless, just as men are. Food for space has to be packed in special ways. Some of it goes into tubes that a man can squeeze into his mouth. Bite-sized cookies are packed in plastic. There is a good reason for covering each bite. The plastic keeps pieces of food from travelling in the spaceship. On the earth very small pieces of food would simply fall to the floor. But gravity doesn’ t pull them to the floor when they are out of the plastic in a spaceship. (78) They move here and there and can get into a man’ s eyes or into the spaceship’ s instruments. If any of the instruments is blocked, the astronauts may have trouble getting safely home. As astronauts travel on longer space trips, he must take time to sleep. An astronaut can fit himsel A. Because small pieces of food would fall down to the floor. B. Because weightless pieces of food might make trouble when they travel around. C. Because they haven’ t enough food for longer trips. D. 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