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下面的短文有15处空白，请根据短文内容为每处空白白确定1个最佳选项。 Unpopular Subjects Is there a place in today’s society for the study of useless subjects in our universities Just over 100 years ago Fitzgerald argued in a well-written letter to Nature that "universities must be allowed to study useless subjects-if (51) don’t, who will" He went on to use the example of Maxwell’s electrodynamics(电动力学) as one case where a "useless subject" has been transformed (转换) to a (52) subject. Nowadays this argument is again very active in many (53) Indeed one suspects that it is one of those arguments that must be fought anew (重新) by each generation. But now there is an (54) twist (歪曲，扭曲) -subjects must not only be useful, they (55) also be popular enough that students will flock (蜂拥) to do them, and even flock to (56) to do them. As universities become commercial operations, the pressure to eliminate(去除) subjects or departments that are less popular will become (57) . Perhaps this is more acutely(尖锐的) felt at the moment by physics. There has been much discussion in the press of universities that are (58) physics departments and incorporate(使合并)them with mathematics or engineering departments. Many scientists think otherwise. They see physics as a (59) science, which must be kept alive if only to provide a (60) for other sciences and engineering. It is of their great personal concern that physics teaching and research is (61) in many universities. How can it be preserved(保留，保存)in the rush towards commercial (62) A major turnaround (转变) in student popularity(讨人喜欢，流行) may have to wait (63) the industrial world discovers that it needs physicists and starts paying them well. Physics is now not only unpopular; it is also "hard". We can do more about the latter by (64) teaching in our schools and universities. We can also develop cooperative arrangements to ensure that physicists (65) their research and teaching up to date.
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“THC费”(Terminal holding charge)即为“港口操作费用”，依据有关规定，不用计入进出口货物的价格中，因此不予在报关单上填报。
下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题确定1个最佳选项。第一篇 Radiation Effect 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 as our protective blanket on earth light, gets through, and this is essential for plants to make the food that we eat. Heat, too, makes our environment endurable. Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are screened off. As soon as men leave the atmosphere they are exposed to this radiation, but their spacesuits or the walls of their spacecrafts, if they are inside, do prevent a lot of radiation damage. Radiation is the greatest known danger to explorers in space. The unit of radiation is called "rem" (“雷姆”). Scientists have reason to think that a man can put up with far more radiation than 0.1 rem without being damaged, the figure of 60 reins has been agreed on. The trouble is that it is extremely difficult to be sure about radiation damage-a person may feel perfectly well, but the cells of his or her sex organs may be damaged ,and this will not be discovered until the birth of deformed(畸形的)children or even grandchildren. Missions of the Apollo flights have had to cross belts of high radiation and, during the outward and return journeys, the Apollo crew accumulated a larger amount of reins. So far, no dangerous amounts of radiation have been reported, but the Apollo missions have been quite short. We simply do not know yet how men are going to get on when they spend weeks and months outside the protection of the atmosphere, working in a space laboratory. Drugs might help to decrease the damage clone by radiation ,but no really effective ones have been found so far. According to the first paragraph, the atmosphere is essential to man in that______。
下面的短文有15处空白，请根据短文内容为每处空白白确定1个最佳选项。 Unpopular Subjects Is there a place in today’s society for the study of useless subjects in our universities Just over 100 years ago Fitzgerald argued in a well-written letter to Nature that "universities must be allowed to study useless subjects-if (51) don’t, who will" He went on to use the example of Maxwell’s electrodynamics(电动力学) as one case where a "useless subject" has been transformed (转换) to a (52) subject. Nowadays this argument is again very active in many (53) Indeed one suspects that it is one of those arguments that must be fought anew (重新) by each generation. But now there is an (54) twist (歪曲，扭曲) -subjects must not only be useful, they (55) also be popular enough that students will flock (蜂拥) to do them, and even flock to (56) to do them. As universities become commercial operations, the pressure to eliminate(去除) subjects or departments that are less popular will become (57) . Perhaps this is more acutely(尖锐的) felt at the moment by physics. There has been much discussion in the press of universities that are (58) physics departments and incorporate(使合并)them with mathematics or engineering departments. Many scientists think otherwise. They see physics as a (59) science, which must be kept alive if only to provide a (60) for other sciences and engineering. It is of their great personal concern that physics teaching and research is (61) in many universities. How can it be preserved(保留，保存)in the rush towards commercial (62) A major turnaround (转变) in student popularity(讨人喜欢，流行) may have to wait (63) the industrial world discovers that it needs physicists and starts paying them well. Physics is now not only unpopular; it is also "hard". We can do more about the latter by (64) teaching in our schools and universities. We can also develop cooperative arrangements to ensure that physicists (65) their research and teaching up to date.
凿粗坯是紧接锼空工序后的一道工序，在厚25mm的花板上，通过凿粗坯，使图案的雕刻形象线条、深浅一致，凿痕分层初具雏形。
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