题目内容
Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts (67) our protective blanket on earth. Light gets through, and this is (68) for plants to make the food (69) we eat. Heat, too, makes our environment endurable. Various kinds of rays (70) through the air from outer space, (71) enormous quantities of radiation from the sun are (72) off. As soon as men leave the atmosphere they are (73) to this radiation but their spacesuits or the walls of their spacecraft, (74) they are inside, do prevent a lot of radiation damage. Radiation is the greatest known (75) to explorers in space. The unit of radiation is called "rein (雷姆)". Scientists (76) reason to think that a man can put up with far more radiation (77) 0.1 rem without being damaged; the figure of 60 rems has been agreed on. The trouble is that it is extremely (78) to be sure about radiation damage-a person may feel perfectly well, but the (79) of his or her sex organs may be damaged, and this will not be discovered (80) the birth, of deformed children or even grandchildren. Missions of the Apollo flights have had to cross belts of high amount of reins. So far, no dangerous amounts of radiation have been (81) , but the Apollo missions have been quite (82) . We simply do not know yet how men are going to get on when they (83) weeks and months outside the (84) of the atmosphere, working in a space laboratory. Drugs might help to (85) the damage done by radiation, but no really (86) ones have been found so far.
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Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts (67) our protective blanket on earth. Light gets through, and this is (68) for plants to make the food (69) we eat. Heat, too, makes our environment endurable. Various kinds of rays (70) through the air from outer space, (71) enormous quantities of radiation from the sun are (72) off. As soon as men leave the atmosphere they are (73) to this radiation but their spacesuits or the walls of their spacecraft, (74) they are inside, do prevent a lot of radiation damage. Radiation is the greatest known (75) to explorers in space. The unit of radiation is called "rein (雷姆)". Scientists (76) reason to think that a man can put up with far more radiation (77) 0.1 rem without being damaged; the figure of 60 rems has been agreed on. The trouble is that it is extremely (78) to be sure about radiation damage-a person may feel perfectly well, but the (79) of his or her sex organs may be damaged, and this will not be discovered (80) the birth, of deformed children or even grandchildren. Missions of the Apollo flights have had to cross belts of high amount of reins. So far, no dangerous amounts of radiation have been (81) , but the Apollo missions have been quite (82) . We simply do not know yet how men are going to get on when they (83) weeks and months outside the (84) of the atmosphere, working in a space laboratory. Drugs might help to (85) the damage done by radiation, but no really (86) ones have been found so far.
Boy, tourism really is a big business these days. It’s (36) It involves hotels, transportation, restaurants, shops, and thousands of people. The tour companies keep telling us what a good thing it is... about how much we can learn about people and (37) , but sometimes I wonder if this is really true. A (38) that I know went abroad last summer. They traveled with a tour group. It’s interesting to (39) their experiences with some of the experiences of other people in the same tour group. My friends, (40) , had some acquaintances, or friends, actually, along the (41) of their tour. In some of the cities they were going to, they knew some local people When they got to (42) places, they could go out with some of the local people and they could eat some of the local food and maybe see some of the local (43) Other members of the tour group, however, never got away from the group at all. They never went out and did a thing on their own. (44) I understand why people wouldn’t go out on their own (45) But it seems to me that (46) If tour companies emphasized that, everyone really would learn about other people and other customs. Boy, tourism really is a big business these days. It’s (36) It involves hotels, transportation, restaurants, shops, and thousands of people. The tour companies keep telling us what a good thing it is... about how much we can learn about people and (37) , but sometimes I wonder if this is really true. A (38) that I know went abroad last summer. They traveled with a tour group. It’s interesting to (39) their experiences with some of the experiences of other people in the same tour group. My friends, (40) , had some acquaintances, or friends, actually, along the (41) of their tour. In some of the cities they were going to, they knew some local people When they got to (42) places, they could go out with some of the local people and they could eat some of the local food and maybe see some of the local (43) Other members of the tour group, however, never got away from the group at all. They never went out and did a thing on their own. (44) I understand why people wouldn’t go out on their own (45) But it seems to me that (46) If tour companies emphasized that, everyone really would learn about other people and other customs.
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