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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Interest is steadily spreading from a minority of enthusiasts in developing renewable sources of energy--wind, wave and solar power, tidal and geothermal energy. Additional support for them has come with a proposal to explore the untapped sources of hydroelectric power in Scotland. The details are presented by Mr. William Manser in a study called "The Case for an Inquiry into Hydroelectric Generation in the North of Scotland". He calls for an expert committee to look at the developments possible for hydroelectric sites and, more important, for means of financing them There is a clear industrial connection in Mr. Manser’s study because it was done for the Federation of Civil Engineering Contractors; hydroelectric schemes, by definition, have a large civil engineering component in them. Mr. Manser estimates that wind power could theoretically provide more than 7 percent of electricity supply in the United Kingdom if suitable sites for generators could be found. However, the practical supply of wind power generation is not likely to be understood until 1990. The best developed and most suitable form of renewable energy is in his view, hydropower. The technology has been developed over centuries and is still progressing. At present it is the cheapest form of electricity generation. Mr. Manser examined past surveys of the north of Scotland and identified several as suitable for hydroelectric generation. Those are in the remote areas, usually of great natural beauty. But Mr. Manser says a well-designed dam can be impressive in itself. It is also possible to make installations possible, to the point of burying parts of them. Hydro generation involves no water pollution, or smoke creation. The main trouble, it appears from his report, is financing an undertaking which has a heavy initial capital cost, and very low running cost. However, Mr. Manser does not see that as an unfamiliar position for the electricity industry. He cites the proposed construction of the new nuclear power station at Sizewell in Suffolk, which will have a high initial capital cost. The argument at Sizewell that the reason for the expenditure is that the capital will provide a benefit in lower costs and higher returns in the long term, applies equally to hydroelectric generation. The most crucial issue concerned by Manser in his study is ______
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.
Passage Three Questions 32 to 35 are based on the passage you have just heard.
Passage One Questions 26 to 28 are based on the passage you have just heard.
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