15000 bài tập tách từ đề thi thử môn Tiếng Anh có đáp án (Phần 46)

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Before the mid-nineteenth century, people in the United States ate most foods only in season. Drying, smoking and salting could preserve meat for a short time, but the availability of fresh meat, like that of fresh milk, was very limited; there was no way to prevent spoilage. But in 1810, a French inventor named Nicolas Appert developed the cooking-and-sealing process of canning. And in the 1850’s an American named Gail Borden developed a means of condensing and preserving milk. Canned goods and condensed milk became more common during the 1860’s, but supplies remained low because cans had to be made by hand. By 1880, however, inventors had fashioned stamping and soldering machines that mass-produced cans from tinplate.

Suddenly all kinds of food could be preserved and bought at all times of the year.

Other trends and inventions had also helped make it possible for Americans to vary their daily diets. Growing urban population created demand that encouraged fruit and vegetable farmers to raise more produce. Railroad refrigerator cars enabled growers and meat packers to ship perishables great distances and to preserve them for longer periods. Thus, by the 1890’s, northern city dwellers could enjoy southern and western strawberries, grapes, and tomatoes, previously available for a month at most, for up to six months of the year. In addition, increased use of iceboxes enabled families to store perishables. As easy means of producing ice commercially had been invented in the 1870’s, and by 1900 the nation had more than two thousand commercial ice plants, most of which made home deliveries. The icebox became a fixture in most homes and remained so until the mechanized refrigerator replaced it in the 1920’s and 1930’s.

Almost everyone now had a more diversified diet. Some people continued to eat mainly foods that were heavily in starches or carbohydrates, and not everyone could afford meat. Nevertheless, many families could take advantage of previously unavailable fruits, vegetables, and dairy products to achieve more varied fare.

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Last year, there were millions of international tourist arrivals across the globe. Whether they were students on their (376)______ years looking for overseas adventure, stressed-out workers hoping to get away for a weekend, or retirees (377)______ to relax in an exotic location- clearly none of them thought they could find the same experience at home. The question is whether foreign travel brings more advantages or disadvantages.

An obvious positive point is that going abroad sometimes helps people to expand their knowledge of the world. If they are (378)_____ - minded, they can learn about new cultures and hopefully gain a more accurate understanding about their way of life. In addition, there is the economic benefit of tourism to countries which have few other resources. It can provide an income to many people within the industry.

Having said that, some people simply go to a foreign resort (379)______ by high walls and therefore learn little about their holiday (380)______. Another issue is that hordes of tourists often spoil the “unspoilt” places they visit. The most recent example of this is Antarctica, where last year cruise ships took thousands of visitors to view the disappearing icebergs and wildlife. Vegetation, nesting penguins and resting walrus are vulnerable

when humans intrude.

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Any list of the greatest thinkers in history contains the name of the brilliant physicist Albert Einstein. His theories of relativity led to entirely new ways of thinking about time, space, matter, energy, and gravity. Einstein's work led to such scientific advances as the control of atomic energy, even television as a practical application of Einstein's work.

In 1902 Einstein became an examiner in the Swiss patent office at Bern. In 1905, at age 26, he published the first of five major research papers. The first one provided a theory explaining Brownian movement, the zig-zag motion of microscopic particles in suspension. The second paper laid the foundation for the photon, or quantum, theory of light. In it he proposed that light is composed of separate packets of energy, called quanta or photons, that have some of the properties of particles and some of the properties of waves. A third paper contained the "special theory of relativity" which showed that time and motion are relative to the observer, if the speed of light is constant and the natural laws are the same everywhere in the universe. The fourth paper was a mathematical addition to the special theory of relativity. Here Einstein presented his famous formula, E = m(cc), known as the energy mass equivalence. In 1916, Einstein published his general theory of relativity. In it he proposed that gravity is not a force, but a curve in the space-time continuum, created by the presence of mass.

Einstein spoke out frequently against nationalism, the exalting of one nation above all others. He opposed war and violence and supported Zionism, the movement to establish a Jewish homeland in Palestine. When the Nazis came to power in 1933, they denounced his ideas. He then moved to the United States. In 1939 Einstein learned that two German chemists had split the uranium atom. Einstein wrote to President Franklind. Roosevelt warning him that this scientific knowledge could lead to Germany developing an atomic bomb. He suggested the United States begin its own atomic bomb research.

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Humans are destroying the earth’s tropical rain forests. About 80,000 square kilometers are being destroyed every year. About a quarter of the (388)_____ comes from people cutting trees for fuel. Another quarter is to make grassland for their cattle. The (389)______ trees are cut down to sell the wood to start farms.

The population in cities all over the world is growing, and more and more wood is needed to build huge new buildings. For example, 5,000 trees from Sarawak rain forest in Malaysia were used to build just one tall building. (390)_______ people continue cutting down that many trees in Sarawak rain forest, all the trees could be gone in eight years.

The world needs more food, and it (391)______ like a good idea to clear the rain forests and use the land for agriculture. Many people think that the land under these huge, thick forests must be in rich nutrients, but it isn't. This is another surprising thing about rain forests. Most of the land in tropical rain forest is very (392)________.