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听力原文：W: I really wish our son would take more interest in our business. I don't know why he wants to be- come an architect.
M: But. Sarah, he's only sixteen. I think he should do what he wants.
Q: What does the man want his son to do？
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听力原文： In the United States almost everyone chews gum, and more than $140 million worth of chewing gum is sold each year. This means that, on the average, each person in the United States spends one dollar a year for chewing gum.
Chewing gum became popular in the United States mainly because of one man, William Wrigley, who was head of the Wrigley Company for many years.
In 1870 Thomas Adams began to experiment with chewing gum. It was he who first made gum soft and pleasant enough to chew. But it was not until Wrigley entered the business in about 1890 that people everywhere began to learn about chewing gum and to use it widely.
Wrigley enjoyed doing things in a big way. In his first year he borrowed money and spent more than a million dollars on advertising. On every streetcar in the United States, for years and years, there was a large advertisement telling all about Wrigley's chewing gum. People complained that wherever they went they would see the name of Wrigley. Several times Wrigley sent free-of-charge pieces of gum to every person in the telephone book of every city and town in the United States. Finally, he began to advertise that it was good for the health to chew gum. His painstaking work in advertising finally brought him huge profits.
Who was the inventor of chewing gum？
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Let us consider what science and technology have to contribute to the food problem.
The simplest way to increase food production, one might suppose, is to bring more land 【C1】______ cultivation and put more people to work on it. Some of the underdeveloped countries have resorted to this 【C2】______ approach, without notable success. It contains several fallacies. For one thing, it usually means 【C3】______ into marginal lands where the soil and climatic conditions give a poor 【C4】______ . Cultivation may quickly deplete this soil,【C5】______ it for pasture or forest growth. It is often possible, of course, to turn such lands into useful farms by agricultural 【C6】______ ; for instance, a sophisticated knowledge of how to use the available water【C7】______ an irrigation system may reclaim semi-arid grasslands for crop-growing. But the cultivation of marginal lands i6 in any case unsuccessful【C8】______ it is carried out by farmers with a centuries - old tradition of experience or by modern ex pelts with a detailed knowledge of the【C9】______ conditions and the varieties of crops that are suitable for those conditions. Such knowledge is【C10】______ absent in the underdeveloped countries.
【C11】______ , we know that highly developed countries have not increased the【C12】______ of acres under cultivation, 【C13】______ on the contrary have 【C14】______ their marginal lands and steadily reduced the proportion of the population engaged in farming. Efficient farming【C15】______ concentration on the most efficient lands, and it results in greater production with【C16】______ people. The problem of the underdeveloped countries, then is to increase the【C17】______ of their farms and farmers. This would allow them to industrialize and to feed their people more adequately. It is not easy to【C18】______ , how ever. The farmers are conservative and resistant to change【C19】______ their methods of cultivation. The underdeveloped countries are greatly in need of studies and experiments to help them to【C20】______ modern agricultural methods to their own conditions.
【C1】
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