-
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 from 30 to 34.
The modern age is an age of electricity. People are so used to electric lights, radio, televisions, and telephones that it is hard to imagine what life would be like without them. When there is a power failure, people grope about in flickering candlelight. Cars hesitate in the streets because there are no traffic lights to guide them, and food spoils in silent refrigerators.
Yet, people began to understand how electricity works only a little more than two centuries ago. Nature has apparently been experimenting in this field for millions of years. Scientists are discovering more and more that the living world may hold many interesting secrets of electricity that could benefit humanity.
All living cells sent out tiny pulses of electricity. As the heart beats. it send out pulses of recorded electricity; they form an electrocardiogram, which a doctor can study to determine how well the heart is working. The brain, too, sends out brain waves of electricity, which can be recorded in an electroencephalogram. The electric currents generated by most living cells are extremely small-of-ten so small that sensitive instruments are needed to record them. But in some animals, certain muscle cells have become so specialized as electrical generators that they do not work as muscle cells at all. When large numbers of these cells are linked together, the effects can be astonishing.
The electric eel is an amazing storage battery. It can send a jolt of as much as eight hundred volts of electricity through the water in which it lives. An electric house current is only one hundred twenty volts.) As many as four fifths of all the cells in the electric eel’s body are specialized for generating electricity, and the strength of the shock it can deliver corresponds roughly to the length of its body.
Câu hỏi:What is the main idea of the passage?
- A. Electric eels are potentially dangerous
- B. Biology and electricity appear to be closely related
- C. People would be at a loss without electricity
- D. Scientists still have much to discover about electricity
Lời giải tham khảo:
Đáp án đúng: B
B. Sinh học và điện dường như có quan hệ chặt chẽ với nhau
Câu hỏi này thuộc đề thi trắc nghiệm dưới đây, bấm vào Bắt đầu thi để làm toàn bài
Hướng dẫn Trắc nghiệm Online và Tích lũy điểm thưởng
CÂU HỎI KHÁC
- Indicate the word whose underlined part differs from the other three in pronunciation: agreed, believed, remarked, smiled
- Indicate the word whose underlined part differs from the other three in pronunciation: exterminate, contemplate, considerate, exaggerate
- Indicate the word that differs from the other three in the position primary stress: comeuppance, charlatan, ignominy, desultory
- Indicate the word that differs from the other three in the position primary stress: communication, media, current, homework
- The live presentation of a...................suspect to a victim or witness of a crime.
- Shawn Mendes is in his..................., which gives him a lot of money and fame.
- We all think that you have had English at your______. Congratulations.
- To prepare for Nam’s birthday, you can’t..................late.
- You shouldn’t.................gone out when your mother was at work. That is the reason why your house was broken into.
- The man..............daughter loves me is my boss. This makes me confused whenever we are in person.
- Loving a girl is not as easy as you think. She may cry sometimes for no..............
- When students ..............truant, they stay away from school without permission
- Let’s go somewhere beautiful to be relaxed when we...............back from Australia after that essential negotiation.
- Diseases have begun spreading in the................of recent disaster.
- ________gene in the human genome to be thoroughly understood, many human diseases could be cured or prevented.
- He doesn’t like the way she.................when they are on the phone.
- Dang Le Trung Nguyen, who is Dang Le Nguyen Vu’s son, is going to.................lots of money from Trung Nguyen Corporation.
- There are two small rooms in the beach house,................served as a kitchen
- During the war, the black market in luxury goods flourished.
- Bill and Nancy just celebrated their fiftieth wedding anniversary. Their marriage has stood the test of time.
- Bill Gates is an altruistic man giving away millions of dollars every year to various charities.
- Nguyen Quang Dat, a successful pilot of Jestar Pacific Airlines has made his dreams come true in the wake of his endeavour in his younger years.
- Nam is talking to Dat about Dat’s wonderful bookNam: How did you read The Alchemist to perceive the intrinsic meaning of it?.”Dat: I read it..
- A waiter in a restaurant is talking to a customer who has just finished his meal there. Select the most suitable response to complete the exchange.
- Any __25___ to the seaside will highlight one of the biggest
- to the seaside will highlight one of the biggest issues
- Blue Planet effect – publicised through David Attenborough’s television series – alongside campaigning by charity Surfers Against Sewage (SAS) has brought the crisis to the forefront of our minds. And it is now
- SAS began life in 1990 as a single-issue campaign group founded by surfers from the villages of St Agnes and Porthtowan on the north coast of Cornwall who were troubled by
- Lesley Kazan-Pinfield, a founding member of SAA
- What is the main idea of
- The author mentions all of the following as results of a blackout EXCEPT..................
- Why does the author mention electric eels?
- The word discovering” in paragraph 2 is closest in meaning to:
- It can be inferred from the passage that the longer an eel is the____
- Which of the following is the best title for
- According to the passage, women pilots were successful in all of the following EXCEPT
- The word recognition” in the paragraph 2 means that___
- What can be inferred from the passage about the United States Air Force in 1938
- The word 'resoursefulness' in the paragraph is closest in meaning to which of the following?
- In their efforts to compete with men, early women pilots had difficulty in
- According to the passage, which following is author’s attitude towards women’s endeavour to be recognized?
- According to the passage, who said that flying was done with no expectation of reward
- Diversity is defined as the fact of much different types of things or people being included in something.
- I used to hold a kick out of reading comics but now I’ve grown out of it.
- It was so a sad film that we had to burst into tears at the end.
- As television programmes become more popular, they seem to get
- The invention of the telephone has made communication easier and easier.
- Hurrah, we have won the match. It’s unbelievable”- Jain said.
- He had just finished eating his dinner. Then he went out.
- USA is capable of producing all of the food that this country consumes every hour.
