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Câu hỏi:

21/07/2024 161

Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions from 35 to 42  

     The elements other than hydrogen and helium exist in such small quantities that it is accurate to say that the universe is somewhat more than 25 percent helium by weight and somewhat less than 75 percent hydrogen.  

     Astronomers have measured the abundance of helium throughout our galaxy and in other galaxies as well. Helium has been found in old stars, in relatively young ones, in interstellar gas, and in the distant objects known as quasars. Helium nuclei have also been found to be constituents of cosmic rays that fall on the earth (cosmicrays are not really a form of radiation; they consist of rapidly moving particles of numerous different kinds). It doesn't seem to make very much difference where the helium is found. Its relative abundance never seems to vary much. In some places, there may be slightly more of it; in others, slightly less, but the ratio of helium to hydrogen nuclei always remains about the same.  

     Helium is created in stars. In fact, nuclear reactions that convert hydrogen to helium are responsible for most of the energy that stars produce. However, the amount of helium that could have been produced in this manner can be calculated, and it turns out to be no more than a few percent. The universe has not existed long enough for this figure to be significantly greater. Consequently, if the universe is somewhat more than 25 percent helium now, then it must have been about 25 percent helium at a time near the beginning.  

          However, when the universe was less than one minute old, no helium could have existed. Calculations indicate that before this time temperatures were too high and particles of matter were moving around much too rapidly. It was only after the one-minute point that helium could exist. By this time, the universe had cooled so sufficiently that neutrons and protons could stick together. But the nuclear reactions that led to the formations of helium went on for only relatively short time. By the time the universe was a few minutes old, helium production had effectively ceased

What does the passage mainly explain?  

A. Why hydrogen is abundant

B. When most of the helium in the universe was formed

Đáp án chính xác

C. How stars produce energy

D. The difference between helium and hydrogen

Trả lời:

verified Giải bởi qa.haylamdo.com

Đoạn văn chủ yếu giải thích điều gì?

A. Tại sao hydro lại dồi dào.

B. Khi hầu hết heli trong vũ trụ được hình thành.

C. Sao tạo ra năng lượng như thế nào.

D. Sự khác biệt giữa heli và hydro.

Đáp án: B

Giải thích: Các đáp án A, C, D đều không được nói đến trong bài. Chỉ có đáp án B được nhắc đến nhiều hơn cả

Câu trả lời này có hữu ích không?

0

CÂU HỎI HOT CÙNG CHỦ ĐỀ

Câu 1:

Read the following passage and mark the letter A, B, C, or Don your answer sheet to indicate the correct answer to each of the questions from 30 to 34  

     The term "dyslexia” is used to describe a number of problems associated with reading, writing or spelling. Short-term memory, mathematics, concentration, personal organization and sequencing may also be affected. We do not know exactly what causes dyslexia, but we do know that it tends to run in the family. We also know that more boys suffer from dyslexia than girls and that dyslexia is more common in urban areas than in rural.  

     One of the most common signs of dyslexia is “reversals”. People with this kind of problem often confuse letters like “b” and "a" when reading and writing or they sometimes read and write words like "tip" and "won" as “pit” and “now”. Other common characteristics are lack of punctuation, misspelling, mixed-up sentence structure and poor grammatical construction.  

     People are born with dyslexia, but it is only when they begin to learn to write that it becomes a noticeable problem. For children with dyslexia, going to school can be a traumatic experience. Poor achievement can make them feel frustrated and insecure. They are reluctant to go to school and sometimes even skip school together, Cheating, stealing and experimenting with drugs can also occur when children regard themselves as failures.  

          It is a common misconception that dyslexic people are of inferior intelligence. Yet Albert Einstein, Leonardo da Vinci, Thomas Edison and Hans Christian Andersen were apparently all dyslexic. There is no total cure for dyslexia; however, the effects of dyslexia can be lessened with the guidance of skilled specialists and a lot of determination

Who is more likely to be dyslexic?  

Xem đáp án » 26/10/2022 1,514

Câu 2:

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three tin the pronunciation in each of the following questions

Xem đáp án » 26/10/2022 552

Câu 3:

Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions

There are many ___________ in our library

Xem đáp án » 26/10/2022 473

Câu 4:

Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions

Before giving presentation, always ___________ the focus on the projector so that everyone can read what is on the screen

Xem đáp án » 26/10/2022 451

Câu 5:

Read the following passage and mark the letter A, B, C, or D on your answer sheet to choose the word or phrase that best fits each of the numbered blanks from 25 to 29  

     Tourism is a big business. Millions of people around Europe spend their winters planning their destinations for the following summer, and their summers (25) ___________ to foreign climes for two weeks in the sun. They are the modern-day descendants of the aristocrats and the wealthy who would take months to complete the "Grand Tour” of Europe. But unlike their forefathers, tourists these days get a bad press. They're not (26) ___________ in the local culture, we're told they're just after the chance to behave a bit more wildly than they do at home. What's more, they damage the local environment and don't respect the locals and their way of life. 

     But are tourists really to blame? (27) ___________is it the fault of the tourist industry, which has failed to provide reasonably-priced alternatives? And if the local resort only offers a succession of bars for the tourists to visit, can we really criticize them for not doing more cultural activities? One holiday company, Far and Away, claims that tourists are crying out for more cultural holidays and believes that it has (28) ___________to come up with a range of package holidays which are affordable, culturally interesting, and environmentally friendly. Their brochure, which is to be (29) ___________ later this month, offers 200 holidays based on cultural themes, including history and architecture, learning the language, meeting the locals.  

Xem đáp án » 26/10/2022 406

Câu 6:

Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions

I don't like to ask people for help as a rule but I wonder if you could ___________ me a favor

Xem đáp án » 26/10/2022 395

Câu 7:

Read the following passage and mark the letter A, B, C, or D on your answer sheet to choose the word or phrase that best fits each of the numbered blanks from 25 to 29  

     Tourism is a big business. Millions of people around Europe spend their winters planning their destinations for the following summer, and their summers (25) ___________ to foreign climes for two weeks in the sun. They are the modern-day descendants of the aristocrats and the wealthy who would take months to complete the "Grand Tour” of Europe. But unlike their forefathers, tourists these days get a bad press. They're not (26) ___________ in the local culture, we're told they're just after the chance to behave a bit more wildly than they do at home. What's more, they damage the local environment and don't respect the locals and their way of life. 

     But are tourists really to blame? (27) ___________is it the fault of the tourist industry, which has failed to provide reasonably-priced alternatives? And if the local resort only offers a succession of bars for the tourists to visit, can we really criticize them for not doing more cultural activities? One holiday company, Far and Away, claims that tourists are crying out for more cultural holidays and believes that it has (28) ___________to come up with a range of package holidays which are affordable, culturally interesting, and environmentally friendly. Their brochure, which is to be (29) ___________ later this month, offers 200 holidays based on cultural themes, including history and architecture, learning the language, meeting the locals.  

Xem đáp án » 26/10/2022 388

Câu 8:

Mark the letter A, B, C, or D to indicate the sentence that is closest in meaning to each of the following questions  

A new book is twice as expensive as an old one

Xem đáp án » 26/10/2022 346

Câu 9:

Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences in the following questions

We live abroad. It is important for us to create a balance between being open sociably and keeping our own values personally

Xem đáp án » 26/10/2022 322

Câu 10:

Mark the letter A, B, C or D to indicate the most suitable response to complete each of the following exchanges

George and Frankie are talking about their hobbies.  

     George: “In my opinion, action films are exciting".  

          Frankie: “___________” 

Xem đáp án » 26/10/2022 319

Câu 11:

Read the following passage and mark the letter A, B, C, or Don your answer sheet to indicate the correct answer to each of the questions from 30 to 34  

     The term "dyslexia” is used to describe a number of problems associated with reading, writing or spelling. Short-term memory, mathematics, concentration, personal organization and sequencing may also be affected. We do not know exactly what causes dyslexia, but we do know that it tends to run in the family. We also know that more boys suffer from dyslexia than girls and that dyslexia is more common in urban areas than in rural.  

     One of the most common signs of dyslexia is “reversals”. People with this kind of problem often confuse letters like “b” and "a" when reading and writing or they sometimes read and write words like "tip" and "won" as “pit” and “now”. Other common characteristics are lack of punctuation, misspelling, mixed-up sentence structure and poor grammatical construction.  

     People are born with dyslexia, but it is only when they begin to learn to write that it becomes a noticeable problem. For children with dyslexia, going to school can be a traumatic experience. Poor achievement can make them feel frustrated and insecure. They are reluctant to go to school and sometimes even skip school together, Cheating, stealing and experimenting with drugs can also occur when children regard themselves as failures.  

          It is a common misconception that dyslexic people are of inferior intelligence. Yet Albert Einstein, Leonardo da Vinci, Thomas Edison and Hans Christian Andersen were apparently all dyslexic. There is no total cure for dyslexia; however, the effects of dyslexia can be lessened with the guidance of skilled specialists and a lot of determination

The purpose of this passage is to inform readers that___________

Xem đáp án » 26/10/2022 316

Câu 12:

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three tin the pronunciation in each of the following questions

Xem đáp án » 26/10/2022 312

Câu 13:

Read the following passage and mark the letter A, B, C, or Don your answer sheet to indicate the correct answer to each of the questions from 30 to 34  

     The term "dyslexia” is used to describe a number of problems associated with reading, writing or spelling. Short-term memory, mathematics, concentration, personal organization and sequencing may also be affected. We do not know exactly what causes dyslexia, but we do know that it tends to run in the family. We also know that more boys suffer from dyslexia than girls and that dyslexia is more common in urban areas than in rural.  

     One of the most common signs of dyslexia is “reversals”. People with this kind of problem often confuse letters like “b” and "a" when reading and writing or they sometimes read and write words like "tip" and "won" as “pit” and “now”. Other common characteristics are lack of punctuation, misspelling, mixed-up sentence structure and poor grammatical construction.  

     People are born with dyslexia, but it is only when they begin to learn to write that it becomes a noticeable problem. For children with dyslexia, going to school can be a traumatic experience. Poor achievement can make them feel frustrated and insecure. They are reluctant to go to school and sometimes even skip school together, Cheating, stealing and experimenting with drugs can also occur when children regard themselves as failures.  

          It is a common misconception that dyslexic people are of inferior intelligence. Yet Albert Einstein, Leonardo da Vinci, Thomas Edison and Hans Christian Andersen were apparently all dyslexic. There is no total cure for dyslexia; however, the effects of dyslexia can be lessened with the guidance of skilled specialists and a lot of determination

The passage states that one common characteristic of dyslexics is that they___________

Xem đáp án » 26/10/2022 297

Câu 14:

Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions

The government issued a warning to local companies that all waste must be disposed of___________ or they will face heavy fines

Xem đáp án » 26/10/2022 287

Câu 15:

Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions

I extend my sincere ___________ to the family and friends of John Miller, who has suddenly left us at the age of 54

Xem đáp án » 26/10/2022 286

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