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Câu hỏi:
Natural pollutants can play an important role in controlling air pollution for which of the following reasons?
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A.
They function as part of a purification process.
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B.
They occur in greater quantities than other pollutants.
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C.
They are less harmful to living beings than are other pollutants.
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D.
They have existed since the Earth developed.
Lời giải tham khảo:
Đáp án đúng: A
Dẫn chứng: Many of the more important air pollutants, such as sulfur oxides, carbon monoxide, and nitrogen oxides, are found in nature. As the Earth developed, the concentrations of these pollutants were altered by various chemical reactions; they became components in biogeochemical cycles.
Hãy trả lời câu hỏi trước khi xem đáp án và lời giải -
A.
Câu hỏi này thuộc đề thi trắc nghiệm dưới đây, bấm vào Bắt đầu thi để làm toàn bài
QUẢNG CÁO
CÂU HỎI KHÁC
- Indicate the word whose underlined part differs from the other three in pronunciation: serves, hopes , likes, writes
- Indicate the word whose underlined part differs from the other three in pronunciation: exact, examine, eleven, elephant
- Indicate the word that differs from the other three in the position primary stress: express, enter, employ, reduce
- Indicate the word that differs from the other three in the position primary stress: preference, attraction, advantage, importance
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- Have you ever considered__________ to study in a foreign country?
- If I__________ in London now, I could visit British Museum.
- Since we came here, we__________ a lot of acquaintances.
- They certainly knew that their task was hard__________ two previous attempts had failed.
- As soon as I__________ a good look at the designs, I _______ them back to you.
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- One man__________ outside his own country is tipped to become the new President.
- Some candidates failed the oral examination because they didnt have enough__________.
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- One of the most valued of all cultural institutions, the library
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- As stated in the passage, in order to communicate successfully with people from another culture, it is advisable for a person__________.
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- The word 'adversely” is closest in meaning to__________.
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- The word altered” is closest in meaning to__________.
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- According to the passage, which of the following is true about human-generated air pollution in localized regions?
- According to the passage, the numerical value of the concentration level of a substance is only useful__________.
- Which of the following is best supported by the passage?
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- They understand more than we do.
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- Every student is required to write an essay on the topic.
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- We arrived at airport. We realized our passports were still at home
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