user-avatar
myanhch2
2 năm trước
Bài 9: Phân tử hợp chất A nặng gấp 4 lần phân tử MgO. Trong 1 phân tử chất A gồm 3 nguyên tử oxi và 2 nguyên tử của nguyên tố X. Xác định nguyên tố X và viết công thức hóa học của A.
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

PART II. PHONOLOGY: Choose the word that has the underlined parts pronounced differently from the others in each group (1p) 1. A. there B. healthy C. gather D. northern 2. A. raised B. practised C. talked D. liked 3. A. days B. ways C. bays D. says 4. A. much B. drug C. future D. buffalo PART III. LANGUAGE FOCUS: I.Choose the best answer from the four choices (A, B,C,D) to complete each of the following sentences (2pts) 1. ____________ is La Tomatina celebrated? – Every August. A. Where B. Why C. When D. Which 2. I __________go on foot when I was in primary school. A. used to B. break C. can D. may 3. Give a________ before you turn left or right. A. signal B. turn C. sound D. sign 4. ____________ being frightened by the images, Lan still liked the film so much. A. In spite B. Despite C. Although D. Nevertheless 5. ________ the film was gripping, Tom slept from beginning to end. A. Therefore B. Despite C. However D. Although 6. Solar energy __________ by many countries in the world in the future. A. use B. will use C. will be using D. will be used 7. __________ is a renewable sourse. A. Coal B. Oil C. Wind D. Gas 8. Nuclear energy can provide electricity for the world needs, but it is __________ A. cheap B. unlimited C. dangerous D. safe II. Put the correct form of the verb in brackets. (1p): 1. Nam (never see) __________________________________ this car before. 2. What____________we (do ) _____________ to save electricity, Dad ? - We will watch less TV. 3. At 10 o’clock tomorrow he ( work ) _____________________ in his office. 4.We (attend) ________________________ the Festival last month. PART IV. READING I. Read the passage and complete the sentences. Circle A, B, or C (1p) The Earth Day comes from the idea of a former US politician Gaylord Nelson. He was worried about the world pollution, and the health of plants and animals. In 1969, he decided that the world should have a special day to teach people about how to make environment better. His idea became popular and on 22 April 1970 the first Earth Day was celebrated. Since then, environmentalists have used the day to educate people about their roles in protecting our planet. Earth Day finally became a global celebration around the world. On this day, people come together to talk about global warming, protecting rare animals and saving energy sources. 1. The Earth Day was first celebrated in ______. A. 1969 B. 1970 C. 2015 2. According to the passage, Gaylord Nelson was ______. A. trying to pollute the environment B. worried about the environment C. not concerned about global warming 3. The word their refers to ______. A. environmentalists’ B. politicians’ C. people’s 4. The best title for the passage can be ______. A. The meaning of the Earth Day B. Preserving our energy sources C. Gaylord Nelson, the politician

1. He drives as ______ she does. A. careful as B. carefully as C. carefully than D. carefully so 2. What is ______ novel you have read? A. the best B. good C. better D. the better 3. This lesson is as ______ as that one. A. interesting B. more interesting C. most interesting D. interestingly 4. That has to be the ______ film she has seen. A. interesting B. more interesting C. most interesting D. interestingly 5. People in cities are not ______ as those in the countryside. A. friendly B. more friendly C. so friendly D. most friendly 6 The Standard of living in the city is ______ than that in the countryside. A better B best C. good D. well 7 When we ______ , we usually ______ a tent on the grass. A. go camping –put up B. go to camp – put up C. will go camping – put up D. go camping – will put up 8. The hotel is ______ place I have ever been to. A. most ideal B. the most ideal C. more ideal D. ideal 9. Harvest is ______ time of year in the countryside. A busiest B. busier C. the busiest D. the most busy 10 I think that riding a horse in the countryside is ______ activity of all. A fascinating B. the most fascinating C. the fascinating D. most fascinating 11. They live ______ with their family in a small cottage. A. happy B. happily C. happiness D. unhappy 12. Life in the countryside is ______ and ______ . A. quiet – peaceful B. quite – peaceful C. quietness – peach D. quietness – peacely 13. Picking apples in the summer is ______ . A. satisfied B satisfy C. satisfying D. satisfaction 14. In some villages, today, there is no ______ . A. electric B electrician C. electricity D. electrical 15. ______ people here are friendly and helpful. A. local B. locality C. location D. locally 16. I am ______ about my trip to the town. A. excite B. excited C. exciting D. excitement 17. I have the feeling of ______ when living in the countryside. A. free B. freely C. freedom D. freeing 18. Many people think that country life is ______ and ______ because it lacks many things such as running water or electricity. A. bored – convenient B. boring–convenient C. bored–inconvenient D. boring–inconvenient 19. It is ______ to find out shopping malls or trade centers in the city. A. easy B ease C easiness D easily 20. I only hope to have a ______ life like other people. A. normal B normally C normality D normalize

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team