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25vladimir12
2 năm trước
viết một đoạn văn ngắn trình bày tình trạng ô nhiễm không khí ở việt nam và đề xuất biện pháp khắc phục
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Câu 6. Thểthực khuẩn (phage) là virut kí sinh ở A. động vật. B. Thực vật. C. Vi khuẩn. D. Người. Câu 7. Virut có chứa bộgen là A. cảADN và ARN. B. ADN. C. ARN. D. ADN hoặc ARN. Câu 8. Khi nói về virut, phát biểu nào sau đây khôngđúng? A. Virut có cấu tạo đơn giản gồm axit nuclêic bao quanh bởi vỏ prôtêin, chỉ chứa một loại axit nucleic ADN hoặc ARN .B. Có kích thước siêu nhỏ, chỉ quan sát được chúng dưới kính hiển vi điện tử .C. Kí sinh nội bào bắt buộc. D. Có chứa ribôxôm nên có thể tự tổng hợp prôtêin cho riêng mình. Câu 9. Một bạn học sinh tiến hành thí nghiệm tách lõi ARN ra khỏi vỏprôtêin của hai chủng virut A và B. Lấy axit nuclêic của chủng A trộn vớimột nửa prôtêin của chủng A vàmột nửa prôtêin của chủng B thì chúng sẽtựlắp ráp đểtạo thành virut lai. Nhiễm chủng virut lai vào tếbào chủthì sẽphân lập được A. chủng virut A . B. chủngvirut B. C. chủng virut lai có lõi của chủng A và vỏcủa chủng B. D. chủng virut lai có lõi của chủng B và vỏcủa chủng A. Câu 10:Khi nhiễm vi sinh vật gây bệnh, người ta thấy có kháng thểxuất hiện trong dịch thểcủa cơ thểnhư: máu, bạch huyết, màng phổi, dịch dạdày,... Loại tếbào nào sau đây có khảnăng sản sinh ra kháng thểđó? A. Đại thực bào. B. Bạch cầu trung tính. C. Tế bào limpho B. D. Tếbào limpho T.

READING Read the passage and complete the sentences. True (T) or false (F) Air pollution is a serious problem in many cities. Motor vehicles, factories and other sources create so much air pollution that it may hang in the air like dirty fog. Air pollution threatens the health of the people who live in cities. City wastes cause water pollution when they are poured into the waterways. These wastes kill fish and make some areas unfit for swimming. In addition, many large cities have difficulties in disposing of their garbage. The amount of garbage grows each year, but places to put it are quickly filling up. Citizens, governments, industries, scientists, and business people must work together in different ways to gradually reduce pollution. For example, most cities have introduced recycling programmes. ¨ 23. Motor vehicles and factories are among some sources of air pollution. ¨ 24. Air pollution doesn’t endanger people’s health in some cities. ¨ 25. Air pollution is the only problem of the environment mentioned in this passage. ¨ 26. Garbage disposal is a problem in many large cities. ¨ 27. Everyone must cooperate to reduce pollution. Read the text and then choose the best answer A, B, C or D Two of the most dangerous storms which affect America are hurricanes and tornadoes. They are very much feared by anyone who may live in the path of their destruction. Every year homes are destroyed by their fury and often lives are lost. Most people who live near the coast are forced to evacuate their homes and to move to safer areas until the storm passes. Floods are caused along the coasts by both the heavy rain and a storm tide that is considerably above normal water level. The high winds, coastal flooding and heavy rains associated with a hurricane cause enormous damage. Hurricanes usually develop between July and October. Once they hit land they carry tremendous power with driving rain and wind. Tornadoes are violent low - pressured storms. These storms occur most often during the summer months and are noticeable by their strong wind and lack of rain. The sky turns black as dust is sucked up into the air. Tornadoes are capable of lifting quite heavy objects from the ground. They can pick up trees and cars right into the air and even uplift heavier objects such as homes and railway cars. Both hurricanes and tornadoes cause millions of dollars worth of damage to life and property every year. Today they can be predicted more easily than in the past, but they cannot be stopped or ignored. 28. What are two of the most dangerous storms which affect America? A.Hurricanes and tornadoes. B.Typhoons and thunderstorms. C.Thunderstorms and hurricanes. D.Hurricanes and typhoons. 29. At which part of the year do hurricanes usually develop? A.July and August only. B.All the year round. C.From the seventh to the ninth month. D.Between July and October. 30. What is the major similarity of both a hurricane and a tornado? A.They cover only a small area. B.They can cause great damage. C.They are not accompanied by rain. D.They have either wind or speed. 31. Which of the following is true of tornadoes and hurricanes? A.They cannot be predicted with accuracy. B.They are easier to control today than in the part. C.They can be predicted today with greater accuracy. D.They cannot be predicted today with greater accuracy. 32. Which of the following was not mentioned in the article? A.The number of people killed each year by these storms. B.The tremendous power killed each year by these storms. C.The damage caused by hurricanes and tornadoes. D.The time of year when they are most likely to strike. WRITING Fill in the blanks with the correct form of the verbs 33. I (not buy) things on the installment system if I were you. 34. If you pass your examination, we (have) a celebration. 35. Mai (live)................... in Hai Phong for five years before she (move) ............... to Ha Noi three years ago. Mong mng giúp ạ Em đag cần gấp ạ!!!!

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