Đề thi chọn học sinh giỏi Tiếng Anh Lớp 8 - Đề 14 (Có hướng dẫn chấm)

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1. pollution while pollutants from storm water and the atmosphere result (6) ______ ‘non-point source’ pollution. Water pollution can have dramatic effects. In many possor nations, there (7) ______ frequent outbreaks of cholera and other diseases because of people drinking untreated water. Humans can even die if they drink contaminated water. Polluted water also causes the (8) ______ of aquatic animals such as fish, crabs, or birds. Other animals eat these dead animals and may also get sick. In (9) ______ , herbicides in water can kill aquatic plants and cause further damage to the environment. So what should we do to (10) ______ water pollution? III. Read the following passage then choose the best option to each statement.( 2.0 points) The atmosphere that originally surrounded Earth was probably much different from the air we breathe today. Earth’s first atmosphere (some 4.6 billion years ago) was most likely hydrogen and helium. The two most abundant gasses found in the universe - as well as hydrogen compounds, such as methane and ammonia, Most scientists feel that this early atmosphere escaped into space from the Earth’s hot surface. A second, more dense atmosphere, however, gradually enveloped Earth as gasses from molten rocks within its hot interior escaped through volcanoes and steam vents. We assume that volcanoes spewed out the same gasses then as they do today: mostly water vapor (about 80 percent), carbon dioxide (about ten percent), and up to a few percent nitrogen. These same gasses probably created Earth's second atmosphere. As millions of years passed, the constant outpouring of gasses from the hot interior - known as outgassing - provided a rich supply of water vapor, which formed into clouds. Rain fell upon Earth for many thousands or years, forming the rivers, lakes, and oceans of the world. During this Lime, large amounts of carbon dioxide were dissolved in the oceans. Through chemical and biological processes, much of the carbon dioxide became locked up in carbon sedimentary rocks, such as limestone. With much of the water vapor already condensed into water and the concentration of carbon dioxide dwindling, the atmosphere gradually became rich nitrogen. It appears that oxygen, the second most abundant gas in today’s atmosphere, probably began an extremely slow increase in concentration as energetic rays from the sun split water vapor into hydrogen and oxygen during a process called photodissociation. The hydrogen, being lighter, probably rose and escaped into space, while the oxygen remained in the atmosphere. This slow increase in oxygen may have provided enough of this gas for primitive plants to evolve, perhaps two to three billion years ago. Or the plants may have evolved in an almost oxygen- free (anaerobic) environment. At any rate, plant growth greatly enriched our atmosphere with oxygen. The reason for this enrichment is that plants, in the presence of sunlight, process carbon dioxide and water to produce oxygen. 1. What is the main idea of the passage? A. The original atmosphere on Earth was unstable. B. The atmosphere on Earth has changed over time. C. Hot underground gasses created clouds, which formed the Earth’s atmosphere. D. Plant growth depended on oxygen in the Earth’s atmosphere. 2. The word “enveloped” in paragraph 2 is closest in meaning to ______. A. surrounded B. changed C. escaped D. characterized 3. The word “they” in paragraph 2 refers to ______. A. gasses B. volcanoes C. steam vents D. rocks 4. According to the passage, outgassing eventually led to all of the following EXCEPT ______.
2. A. increases in the carbon dioxide content of sedimentary rocks B. the formation of bodies of water C. decreases in the level of nitrogen D. the formation of clouds 5. The word “gradually” in paragraph 3 is closest in meaning to ______. A. accidentally B. quickly C. in the end D. by degrees 6. The passage suggests that oxygen remained in the atmosphere because ______. A. it was caused by outgassing B. it was heavier than hydrogen C. hydrogen became trapped in limestone D. rays from the sun created equal amounts of hydrogen and oxygen 7. The author uses the word “Or” in paragraph 5 to ______. A. criticize the previous suggestion C. propose a similar idea B. provide unrelated information D. suggest an alternative 8. The phase “At any rate” in paragraph 5 is closest in meaning to ______. A. regardless B. in addition C. although unlikely D. fortunately 9. The author organizes the discussion of the Earth’s atmosphere in terms of the ______. A. role of volcanoes in its formation B. occur in which changes C. time it took for the Earth’s surface: to cool and nitrogen to appear D. chemical and physical features of gasses 10. Which of the following does the passage mention as necessary for both the production of oxygen by photodissociation and the production of oxygen by plants? A. Water B. Hydrogen C. Carbon dioxide D. Nitrogen SECTION D: WRITING I. Rewrite each of the following sentences in such a way that it means the same as the first one. (2.0 points) 1. Vinh keeps forgetting his homework. => Vinh is ____________________________________________________________. 2. My English friend finds using chopsticks difficult. => My English friend isn't ________________________________________________. 3. “I will pay the meal.” She said => She insisted _________________________________________________________. 4. The book is so interesting that children should read it . => It is such __________________________________________________________. 5. We haven’t seen each other for over two years. The last time ________________________________________________________. 6. “Shut the door but don’t lock it”, he said to us. He told ____________________________________________________________. 7. As my grandmother grows older, she becomes more intolerant. → The older___________________________________________________________. 8. Jane broke the cup because of her carelessness. Because Jane_______________________________________________________. 9. I'm sorry that I can’t go with you now. I regret____________________________________________________________.
3. 10. We had only just arrived home when the police called. => No sooner _________________________________________________________. II. Use the suggested words to make complete sentences. (1.0 Point) 1. It / difficult / prevent / people / park here. .................................................................................................................................... 2. He / stop / smoke / save / money. .................................................................................................................................... 3. Because / heavy rain / many students / late / class. .................................................................................................................................... 4. He / suggest / use / gas / instead/ burn/ coal / for / cook. .................................................................................................................................... 5. She / looking forward / see / boyfriend / again .................................................................................................................................... III. Paragraph writing (2 points) Write a paragraph (about 120 – 200 words) about the importance of learning English. . . . . . . . . . . Đ 14 Biểu điểm, đáp án chấm đề thi HSG lớp 8 Năm học: 2019-2020 Môn: Tiếng Anh
4. SECTION A: PHONETICS 1. A. ploughs 2. B. ugly 3. B. prepared II. Choose the word A, B, C or D whose main stress is different from the others in the group.(0.4 point) 4. B. expect 5. A. comparison SECTION B: VOCABULARY & GRAMMAR. I. Choose the best answer to complete each sentence, identify your answer by circling the corresponding letter A, B, C, or D. )(2.0 points) 1. D. neither is he 2. A. so that 3. B. ourselves 4. A. due to 5. C. have - had - serviced 6. B. Would you mind 7. A. nomads 8. A. evil 9. D- pretty new red cotton 10. A. to study II. Supply the correct tense or form of the verbs in brackets. (2.0 points) 1. being asked 2. make 3. was studying 4. aren’t you working 5. going 6. is increasing 7. had watched 8. did he book 9. cleaned 10. has been done III. Give the correct form of the words in capital to complete the sentences. (2.0 point) 1. peace 2. legendary 3. pollutants 4. presentation 5. environmental IV. Circle the letter A,B,C or D before the mistake in each sentence and correct it. (1.0 point) 1. B => seriously 2. B => excited 3. B => not to drive 4. A=> to meet 5. A => was flying SECTION C: READING. I/Read the following passage and choose the best option to complete it. (2 points) 1. C 2. B 3. D 4. A 5. C 6. A 7. A 8. D 9. B 10. C II/ Complete the passage by using ONE suitable word for each blank (2 points). 1. pollution 2. one 3. causes 4. insects 5. lead 6. in 7. are 8. death 9. addition 10. reduce
5. III. Read the following passage, then answer the questions by circling A, B, C or D (2 points) 1. B 2. A 3. B 4. C 5. D 6. B 7. D 8. A 9. B 10. A SECTION D: WRITING I. Rewrite each of the following sentences in such a way that it means the same as the first one. (2.0 points) 1. Vinh is always forgetting his homework. 2. My English friend isn’t used to using chopsticks. 3. She insisted on paying the meal. 4. It is such an interesting book that children should read it. 5. The last time we saw each other was two years ago. 6. He told us to shut the door but not to lock it. 7. The older my grandmother is, the more intolerant she becomes. 8. Because Jane was careless, she broke the cup. 9. I regret not to go with you now. 10. No sooner had we arrived home than the police called. II. Use the suggested words to make complete sentences. (1.0 Point) 1. It is difficult to prevent people from parking here. 2. He stops/stopped smoking to save money. 3. Because of the heavy rain, many students were late for class. 4. He suggests using gas instead of burning coal for cooking 5. She is looking forward to seeing her boyfriend again. III. Paragraph writing (2 points) Write a paragraph (about 120 – 200 words) about the importance of learning English. - Good organization ( topic sentence, supporting sentences, concluding sentence, Ideas and linking words ): 0.5 point - Lexical resource: 0,5 point - Grammatical range: 1.0 point