Câu hỏi:
21/10/2021 2,174Read 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 36 to 42.
Any rock that has cooled and solidified from a molten state is an igneous rock. Therefore, if the Earth began as a superheated sphere in space, all the rocks making up its crust may well have been igneous and thus the ancestors of all other rocks. Even today, approximately 95 percent of the entire crust is igneous. Periodically, molten material wells out of the Earth's interior to invade the surface layers or to flow onto the surface itself. This material cools into a wide variety of igneous rocks. In the molten state, it is called magma as it pushes into the crust and lava when it runs out onto the surface.
All magma consists basically of a variety of silicate minerals (high in silicon-oxygen compounds), but the chemical composition of any given flow may differ radically from that of any other. The resulting igneous rocks will reflect these differences. Igneous rocks also vary in texture as well as chemistry. Granite, for instance, is a coarse-grained igneous rock whose individual mineral crystals have formed to a size easily seen by the naked eye. A slow rate of cooling has allowed the crystals to reach this size. Normally, slow cooling occurs when the crust is invaded by magma that remains buried well below the surface. Granite may be found on the surface of the contemporary landscape, but from its coarse texture we know that it must have formed through slow cooling at a great depth and later been laid bare by erosion. Igneous rocks with this coarse-grained texture that formed at depth are called plutonic.
On the other hand, if the same magma flows onto the surface and is quickly cooled by the atmosphere, the resulting rock will be fine-grained and appear quite different from granite, although the chemical composition will be identical. This kind of rock is called rhyolite. The most finely grained igneous rock is volcanic glass or obsidian, which has no crystals. Some researchers believe this is because of rapid cooling; others believe it is because of a lack of water vapor and other gases in the lava. The black obsidian cliffs of Yellowstone National Park are the result of a lava flow of basalt running head on into a glacier. Some of the glacier melted on contact, but suddenly there also appeared a huge black mass of glassy stone.
The word "contemporary'' in paragraph 2 is closest in meaning to____________
Đáp án chính xác
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Trả lời:
Giải bởi Vietjack
Đáp án C
- contemporary ~ existing (adj): hiện thời, hiện hữu
- vast (adj): rộng lớn
- natural (adj): tự nhiên
- uneven (adj): gồ ghề
Nhà sách VIETJACK:
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 best combines each pair of sentences in the following questions
If only I had taken part in the Singing contest. I didn’t do that
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21/10/2021
4,675
Câu 2:
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions
Thanh is a friendly girl who_____________everyone she meets
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21/10/2021
3,031
Câu 3:
Mark the letter A, B, C, or D on your answer sheet to indicate the option that best completes each of the following exchanges
Tim is talking to Tom about their friends' marriage.
Tim: "They got divorced." - Tom:" _____________"
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21/10/2021
2,437
Câu 4:
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 26 to 30.
The result of Mary's first term exams came out and when her mother went to collect it, she was (26) _____________to see Mary's poor result. On reaching home, she called Mary, scolded her and in the end gave her some advice regarding her studies. She told Mary to work hard, (27) _____________very carefully to the teacher and stop wasting her time in useless activities. But Mary turned a deaf ear to her mother's advice. Soon she realised that she had lost her (28) _____________in the class. The teachers didn't think so well of her now due to her poor marks and some of her good friends, who were also good in studies, preferred to sit in the class and spend time with those who were good in studies. She realised that life was not about having fun only; it is about doing something (29) _____________in order to achieve something. She then started to work hard. Her grades eventually (30) _____________and her teachers were satisfied with her. Her mother was glad that she had accepted her advice. Mary continued to work hard and she did very well in her final exams. If she had not accepted her mother's advice she would not have been successful
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21/10/2021
2,282
Câu 5:
Mark the letter A, B, C, or D on your answer sheet to indicate the option that best completes each of the following exchanges
Hoa: "Mommy, I've passed the final exam with flying colours." Mom: “_____________”
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21/10/2021
1,955
Câu 6:
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
Many immigrants were compelled to assimilate into the dominant culture.
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21/10/2021
1,787
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