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Read the following passage and then choose the best answer A, B, C or D. Glass is a remarkable substance made from simplest raw materials. It can be colored or colorless, monochrome or polychrome, transparent, translucent or opaque. It is lightweight impermeable to liquids, readily cleaned and reused, durable yet fragile, and often very beautiful. Glass can be decorated in multiple ways and its optical properties are exceptional. In all its myriad forms-as table ware, containers, in architecture and design-glass represents a major achievement in the history of technological developments. Since the Bronze Age about 3,000 B.C, glass has been used for making various kinds of objects. It was first made from a mixture of silica, line and an alkali such as soda or potash, and these remained the basic ingredients of glass until the development of lead glass in the seventeenth century. When heated, the mixture becomes soft, and malleable and can be formed by various techniques into a vast array of shapes and sizes. The homogeneous mass is thus formed by melting then cooling to create glass, but in contrast to most materials formed in this way (metals, for instance), glass lacks the crystalline structure normally associated with solids, and instead retains the random molecular structure of a liquid. In effect, as molten glass cools, it progressively stiffens until rigid, but does so without setting up a network of interlocking crystals customarily associated with that process. This is why glass shatters so easily when dealt a blow, why glass deteriorates over time, especially when exposed to moisture, and why glassware must be slowly reheated and uniformly cooled after manufacture to release internal stresses induced by uneven cooling.Another unusual feature of glass is the manner in which its viscosity changes as it turns from a cold substance into a hot, ductile liquid. Unlike metals that flow or “freeze” at specific temperatures, glass progressively softens as the temperature rises, going through varying stages of malleability until it flows like a thick syrup. Each stage of malleability allows the glass to be manipulated into various forms, by different techniques, and if suddenly cooled the object retains the stage achieved at that point. Glass is thus amenable to a greater number of heat-forming techniques than most other materialsWhy does the author list the characteristics of glass in paragraph 1?
BÀI ĐỌC DÀIĐọc đoạn văn và trả lời 10 câu hỏi kèm theo. Line5 10 15 20 25In the early 1800’s, over 80 percent of the United States labor force was engaged in agriculture. Sophisticated technology and machinery were virtually nonexistent. People who lived in the cities and were not directly involved in trade often participated in small cottage industries making handcrafted goods. Others cured meats, silversmiths, candle or otherwise produced needed goods and commodities. Blacksmiths, silversmiths, candle makers, and other artisans worked in their homes or barns, relying on help of family.[A] Perhaps no single phenomenon brought more widespread and lasting change to the United States society than the rise of industrialization. Industrial growth hinged on several economic factors. First, industry requires an abundance of natural resources, especially coal, iron ore, water, petroleum, and timber-all readily available on the North Americancontinent. Second, factories demand a large labor supply. Between the 1870’s and the First World War (1914-1918), approximately 23 million immigrants streamed to the United States, settled in cities, and went to work in factories and mines. They also helped build the vast network of canals and railroads that crisscrossed the continent and linked important trade centers essential to industrial growth.[B] Factories also offered a reprieve from the backbreaking work and financial unpredictability associated with farming. Many adults, poor and disillusioned with farm life, were lured to the cities by promises of steady employment, regular paychecks, increased access to goods and services, and expanded social opportunities. Others were pushed there when new technologies made their labor cheap or expendable; inventions such as steel plows and mechanized harvesters allowed one farmhand to perform work that previously had required several, thus making farming capital-intensive rather than labor-intensive.[C] Whereas cottage industries relied on a few highly skilled craft workers who slowly and carefully converted raw materials into finished products from start to finish, factories relied on specialization. While factory work was less creative and more monotonous, it was also more efficient and allowed mass production of goods at less expense [D]What aspect of life in the United States does the passage mainly discuss?
BÀI LUẬNChọn 01 cụm từ hoặc câu trong 04 lựa chọn cho sẵn trong mỗi câu hỏi để điền vào chỗ trống tương ứng trong bài luận đã choSome people assert that playing games is important for adults. In my opinion, the importance of playing games depends on the types of games considered. (1)______________.The games that are important for adults to play include those requiring action, intensive thinking and team work. It has been medically proven that physical training is extremely important for adults. It helps not only to maintain fitness, but also enhances the capacity of thinking and working. Therefore, participating in sports games, such as basketball, football, tennis and other action games is essential. Games that require intensive thinking develop logic, attention and unconventional approach. (2) ______________. And last, but not least, games that involve team work are important to develop further communicability, ability to make correct decisions with consideration of opinions of different people and other skills, because these skills are often used in everyday situations.Still there are other types of games that may be harmful. These are majorly computer games, which cause severe eye pain and exposure to radiation. (3) ______________, computer games not only harm health, but also have a negative impact on the working capacity. Many companies have stringent rules against their employees playing games during work-hours.(4) ______________. These are games played for money. On one hand, winning such a game the player feels positive emotions, which have an overall positive influence on the player’s health and financial situation. On the other hand, loosing the game can drive the person playing into disappointment and even into depression, thus harming his health, not to mention the loss of money.Thus, in my opinion, the importance of adults playing games can be evaluated depending on the level of positive or negative influences that those games may have on the person involved.Chọn 01 cụm từ hoặc câu trong 04 lựa chọn cho sẵn để điền vào chỗ trống số (4)