Read 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.
What does the author imply about the raw materials used to make glass?
A. They were the same for centuries
B. They are liquid
C. They are transparent
D. They are very heavy
Giải bởi qa.haylamdo.com
Đáp án A.
Keywords: raw materials, make glass.
Clue: “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”: Thủy tinh được làm từ hỗn hợp silic, thép, chất kiềm ví dụ như Natri cacbonat hoặc Kali cacbonat, và đây vẫn là các nguyên liệu cơ bản của thủy tinh cho đến khi có sự phát triển của thủy tinh chì vào thể kỷ 17.
Phân tích: Đến thế kỷ 17, các nguyên liệu cơ bản để tạo ra thủy tinh vẫn không thay đổi. Do đó, chọn đáp án A. They were the same for centuries: Các nguyên liệu thô vẫn như vậy trong nhiều thế kỷ.
Các đáp án khác không phù hợp:
B. They are liquid: Các nguyên liệu thô là chất lỏng.
C. They are transparent: Các nguyên liệu thô trong suốt.
D. They are very heavy: Các nguyên liệu thô rất nặng
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
It was difficult to guess what her__________ to the news would be
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.
People believe that 13 is an unlucky number.
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
The politician tried to arouse the crowd, but most of them were_______to his arguments.
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
The newcomer has got few friends, __________?
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
The show was very funny. They were___________sport commentators.
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Maria is talking to Ann after work.
Maria: “____________?”
Ann: “With pleasure.”
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.
Gilbert Newton Lewis, a chemist, helped to develop the modem electron theory of valence, a theory what explains the forces holding atoms together in molecules
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
I do not believe that this preposterous scheme is__________of our serious consideration.
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
He decided to buy some chocolate kept in an________container for his father
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.
Lady Liberty has long been a symbol of free and hope to people all over the world, but have you ever wondered where she came from?
Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.
Pop music is not my cup of tea; I prefer classical music.
Mark the letter A, B C or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.
In 1864 George Pullman designed a sleeping car that eventually saw widespread use
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Harry and Kate are talking in Harry’s office.
Kate: “May I open the window?”
Harry: “_________”
Mark the letter A, B, c, or D on you answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.
We had had very salty food. We were all dying of thirst.
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
It’s a pity you didn’t ask because I________you
