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Câu hỏi:

20/07/2024 116

Read the following passage and mark the letter (A, B, C or D) on your answer sheet to indicate the correct answer to each for the question from 43 to 50.

ACID DUST

“ Calcite- containing dust particles blow into the air and combine with nitric acid in polluted air from factories to form an entirely new particle – calcium nitrate , ” said Alexander Laskin, a senior research scientist at the Department of Energy’s Pacific Northwest National Laboratory in Richland, Washington .These nitrates have optical and chemical properties that are completely different from those of the originally dry dust particles . Due to this, climate models need to be updated to reflect this chemistry. Calcite dust is common in arid areas such as Israel, where scientists collected particles for analysis.

 Working from a mountaintop, the team collected dust that had blown in from the northern shores of Egypt, Sinai,and southern Israel. The particles had combined with air containing pollutants that came from Cairo.They analyzed nearly 2,00 individual particles and observed the physical and chemical changes at the W.R Wiley Environmental Sciences Laboratory.

 A key change in the properties of the newly formed nitrate particles is that they begin to absorb water and retain the moisture .These wet particles can scatter and absorb sunlight-presenting climate modelers, who need to know where the energy is going , a new wild card to deal with . Companion studies of dust samples from the Sahara and the Saudi coast and loess from China show that the higher the calcium in the mineral , the more reactive they are in with nitric acid .And once the particle is changed , it stays that way.

 “When dust storms kick up these particles and they enter polluted areas , the particles change ,” Laskin said . “To what extent this is happening globally, as more of the world becomes industrialized , we don’t know . But now we have the laboratory and field evidence that shows it is definitely happening . The story is much more complicated than anybody thought .”

In the third paragraph , what does the term “ wild card ” mean ?

A. An unknown card in a card game

B. An unknown item in the scientists’ calculations

Đáp án chính xác

C. A large amount of acid dust

D. A,B and C are incorrect 

Trả lời:

verified Giải bởi Vietjack

Đáp án là B

Ở đoạn văn thứ 3, thuật ngữ “ wild card” có nghĩa là gì?

A. Một quân bài không biết trong một ván bài.

B. Một vật không biết trong tính toán của các nhà khoa học.

C. Một lượng lớn bụi axit

D. A, B và C đều không đúng.

Dẫn chứng: These wet particles can scatter and absorb sunlight-presenting climate modelers, who need to know where the energy is going , a new wild card to deal with 

Câu trả lời này có hữu ích không?

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CÂU HỎI HOT CÙNG CHỦ ĐỀ

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Read the text below and decide which answer (A, B, C or D) best fits each space.

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Câu 2:

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

She forgot about the money until she got home.

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Câu 3:

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

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Câu 4:

Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the rest in the position of the main stress in each of the following questions

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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

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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:

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 8:

Read the text below and decide which answer (A, B, C or D) best fits each space.

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Keeping fit and healthy may seem difficult, but there are a few easy-to-follow guidelines. Firstly, a balanced diet is absolutely essential. This (31)_______selecting food that is low in salt and sugar. Experts recommend reducing the amount of fat in your diet, as too much can lead to heart problems. They also suggest increasing the (32)_______of high fiber food we eat. This comes in the form of fresh fruit, vegetables, whole meal bread and pasta. As well as being packed with vitamins and minerals, they are delicious too. Secondly, it’s important to fit exercise into your daily (33)_______This can be done by simply walking as much as possible and climbing stairs instead of taking the lift. Exercise is necessary to maintain a healthy body, as well as increasing energy levels and (34)_______you feel generally fitter and happier. Finally, staying relaxed is important for good health. Too much stress can lead to a variety of illnesses, from headaches to high blood pressure. (35)_______possible, do things you enjoy and treat yourself occasionally. So the message is simple- enjoy yourself but learn to respect your body too. It’s all a question of getting the balance right

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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 10:

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 11:

Read the text below and decide which answer (A, B, C or D) best fits each space.

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Câu 12:

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

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Câu 13:

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 14:

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best joins each of the following pairs of sentences in each of the questions

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Câu 15:

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’t possibly make any _______ for her, however sweetly she asks

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