题目内容
A．comes inB．went out ofC．leavesD．left
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The influence of advertising is felt in every phase of American life. (The advertiser made the cigarette synonymous with masculine virility and suave sophistication.) He gave birth to the multi-million dollar chewing gum industry by promising to double the public's pleasure and fun. Brand names for tooth-pastes, soaps, detergents, and deodorants have, through his efforts, become household expressions. Perhaps a public service was performed when advertisers were asked to convince the American public that it should eat horse mackerel. The advertising industry met this challenge by changing the horse mackerel's name to tuna fish.
Which of the following expresses the main idea？
A．asB．thatC．in orderD．quickly
If it were only necessary to decide whether to teach elementary science to everyone on a mass basis or to find the gifted few and take them as far as they can go, our task would be fairly simple. The public school system, however, has no such choice, for the jobs must be carried on at the same time. Because we depend so heavily upon science and technology for our progress, we must produce specialists in many fields. Because we live in a democratic nation, whose citizens make the policies for the nation, large numbers of us must be educated to understand, to support, and when necessary, to judge the work of experts. The public school must educate both producers and users of scientific services.
In education, there should be a good balance among the branches of knowledge that contribute to effective thinking and wise judgment. Such balance is defeated by too much emphasis on any one field. This question of balance involves not only the relation of the natural sciences, the social sciences, and the arts but also relative emphases among the natural sciences themselves.
Similarly, we must have a balance between current and classical knowledge. The attention of the public is continually drawn to new possibilities in scientific fields and the discovery of new knowledge; these should not be allowed to mm our attention away from the sound, established materials that form. the basis of courses for beginners.
According to the first paragraph, the task of education is fairly complicated because ______.
Magnesium is another mineral we now obtain by collecting huge volumes of ocean water and treating it with chemicals. Although originally it was derived only from brines or from the treatment of such magnesium-containing rocks as dolomite, of which whole mountain ranges are composed. In a cubic mile of sea water there are about four million tons of magnesium. Since the direct extraction method was developed about 1941, production has increased enormously. It was magnesium from sea that made possible the wartime growth of the aviation industry, for every, air plane made in the United States (and in most other countries as well) contains about haft a ton of magnesium metal. And it has innumerable uses in other industries where a lightweight metal is desired, besides its long-standing utility as an insulating material, and its use in printing inks, medicines, and toothpaste.
What is the main topic of this passage？
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