Câu hỏi:
17/03/2020 714Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.
Glass is a remarkable substance made from the 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 thus formed by melting then cools 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 customarilyassociated 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 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 shape achieved at that point. Glass is thus amenable to a greater number of heat-forming techniques than most other materials.
According to the passage, how is glass that has cooled and become rigid different from most other rigid substances?
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Trả lời:
Đáp án D.
Keywords: cooled and become rigid, other rigid substances.
Clue: “….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”: ... đối lập với hầu hết những nguyên liệu được hình thành theo cách này (ví như kim loại), thủy tinh thiếu cấu trúc pha lé thường liên quan đến chất rắn, và thay vào đó giữ lại cấu trúc phân tử ngẫu nhiên của chất lỏng. Trên thực tế, khi thủy tinh nóng chảy nguội, nỏ sẽ dần dần đặc lại cho đến khi cứng lại.
Đáp án đúng là D. It has a random molecular structure: Nó có cấu trúc phần từ ngẫu nhiên - có từ khóa xuất hiện trong manh mối.
Các đáp án khác không phù hợp:
A. It has an interlocking crystal network: Nó có mạng lưới tinh thể liên kết với nhau.
B. It has an unusually low melting temperature: Nó có nhiệt độ tan chảy thấp khác thường.
C. It has varying physical properties: Nó có tính chất vật lý hay thay đổi.
Đã bán 152
Đã bán 114
Đã bán 132
Đã bán 47
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Câu 4:
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Câu 5:
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Câu 6:
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
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Câu 7:
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