Câu hỏi:
23/03/2020 549Read 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 from 38 to 42.
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 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 shape achieved at that point. Glass is thus amenable to a greater number of heat-forming techniques than most other materials.
The word “customarily” in paragraph 2 could best be replaced by “__________”.
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Trả lời:
Đáp án C.
Dịch nghĩa: Từ “customarily” trong đoạn 2 có thể được thay thế tốt nhất bởi __________.
A. tự nhiên
B. cần thiết
C. thường xuyên
D. đương nhiên
CÂU HỎI HOT CÙNG CHỦ ĐỀ
Câu 1:
Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
The children couldn't go swimming because the sea was too rough.
Câu 2:
Mark the letter A, B, C or B on your answer sheet to indicate the word(s) CLOSET in meaning to the underlined word(s) in each of the following questions.
He didn’t bat an eyelid when he realized lie failed the exam again.
Câu 3:
Mark the letter A, B, C or B on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.
Because Jack defaulted on his loan, the bank took him to court.
Câu 4:
Mark the letter A, B, c, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions
Caroline (A) has worn her new (B) yellow dress only (C) once since she (D) buys it.
Câu 5:
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
The success of shared holidays depends on ______ you shared it with.
Câu 6:
Mark the letter A, B, C or B on your answer sheet to indicate the word(s) CLOSET in meaning to the underlined word(s) in each of the following questions.
During the earthquake, a lot of buildings collapsed, which killed thousands of people.
Câu 7:
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
We can enjoy live programmes through _________ satellites.
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