Hỗn hợp X gồm Mg, CuO, Fe3O4 và FeCO3 ( trong đó nguyên tố oxi chiếm 22,04% về khối lượng). Hoà tan hoàn toàn 21,78 gam X vào 480ml dung dịch HNO3 2M, thu được dung dịch Y chỉ chứa muối và 1,344 lít hỗn hợp khí Z gồm N2O, NO, CO2 có tỉ khối so với H2 là 18,5. Cho Y phản ứng tối đa với 885 ml dung dịch NaOH 1M (đun nóng), thu được kết tủa T. Nung T trong không khí đến khối lượng không đổi, thu được 24 gam chất rắn. Phần trăm khối lượng của Mg trong X có giá trị gần nhất với: A. 27,5 B. 30,2 C. 22,1 D. 16,5 - mk cám ơn-

Xác định thành phần biệt lập được sử dụng trong câu văn trên và cho biết nó có tác dụng gì Cuộc chiến này không phải chiến tranh giữa các vì sao mà trận tuyến là 2 giống loài trên địa cầu này : con người vào vi rút

Đế quốc Mĩ can thiệp sâu vào cuộc chiến tranh xâm lược Đông Dương từ sau thất bại nào? A, Chiến dịch Việt Bắc thu đông 1947. B, Chiến dịch Điện Biên Phủ 1954. C, Chiến dịch Biên giới thu đông 1950. D, Cuộc tiến công chiến lược Đông Xuân 1953 – 1954.

Lập bảng biến thiên giúp mjk vs ạ

Rút gọn các biểu thức sau , nhanh vs nha

Lập bảng biến thiên giúp mjk vs ạ

1. Sue doesn’t use her motorbike on weekdays because she ______ to work. A. is walking B. has walked C. walks D. has been walking 2. It’s been a long time since you’ve seen him, ______? A. isn’t it B. is it C. haven’t you D. hasn’t it 3. Maria is ______ with money than her husband, John. A. careful B. as careful C. most careful D. more careful 4. He asked me if the taxi ______ yet. A. had arrived B. arrived C. arrives D. has arrived 5. She ______ the same car for fifteen years. A. has driven B. drives C. drove D. is driving 6. His headache was bad yesterday. Today it is ______. A. worse B. bad C. worst D. more bad 7. You have sugar in your coffee, ______? A. haven’t you B. don’t you C. aren’t you D. isn’t you 8. He asked me who the editor of that book ______. A. was B. were C. is D. has been 9. Vicky, ______ name was missed off the list, wasn’t very pleased. A. which B. whose C. who D. whom 10. My friend works ______ a chemist’s ______ the town center. A. at – in B. in – in C. at – on D. at – at 11. She is ______ with learning history lessons. A. excited B. interested C. terrified D. bored 12. I think you had better ______ to the doctor. Those spots look infectious. A. go B. to go C. going D. to going 13. Those trees, ______ have the beautiful flowers, grow near the gate of the garden. A. that B. whom C. who D. which 14. Kevin never seems to get tired. I wish I ______ his energy. A. can have B. have had C. had D. would have 15. Mum is always busy ______ her work in the laboratory. A. with B. at C. in D. of 16. He finished ______ his essay just as the bell rang. A. writing B. to write C. write D. to writing 17. Do you have _________ idea of how to do this exercise? A. some B. any C. much D. little 18. I wish I ______ in a big house with a beautiful garden. A. lived B. live C. will be living D. am living 19. I wanted to buy a newspaper, ______ I didn’t have enough money. A. or B. but C. and D. because 20. I have __________ cereal every morning, it is good for my health A. a B. many C. some D. any 21. Bill’s favorite show was on. He reached to turn on the TV ______ he could watch it. A. because of B. therefore C. so that D. although 22. Sometimes I get really __________ when I can’t express myself well in English. A. frustrated B. frustrating C. frustration D. frustratingly 23. The _________ of old buildings should be taken into consideration. A. preserve B. preservation C. preservative D. preserves 24. My father used to ____ a lot of challenges before establishing his own insurance company. A. provide B. enjoy C. give D. face 25. My teacher ________ me to take this examination. A. encouraging B. encouragingly C. encouragement D. encouraged 26. I feel extremely depressed as conflict ___________ frequently amongst generations in my family. A. comes on B. comes up C. comes in D. comes into 27. "You look very pretty in this dress." – “____” A. It's so nice of you to say that. B. Yes, it is fairly expensive. C. I see what you mean. D. Thanks for your wish. 28 He doesn't completely trust online partners, as they usually hide their real __________. A. argument B. decision C. opinion D. identity 29. “You're late again, Peter.” – “____” A. It's none of your business. B. Only 5 minutes left. C. I'm sorry. My car was broken this morning. D. I expect not to be fired. 30. The ____ arises when Jack and his parents have considerable disagreement on his choice of university. A. discrimination B. conflict C. agreement D. gap

giúp mik 2 câu này với nhanh,đúng ,đầy đủ vote tlhn nhé

32. The last time Mary wrote to her friend was two years ago.--- > Mary has ______________ 33. My father no longer takes me to the park. My father used ________________ 34. Mr. Baker will decorate the house next week.  The house ___________________ 35. How long is it since you last went to school ? --- > When ___________ ? 36. “ What do you buy in this shop here ? “ --- > She asked me ______________ . 37. We can’t do out because we don’t have money . --- > If _________________ . 38. By learning English , you can get information easy . --- > If _____________ . 39. The children can’t swim here because the water is not clean . -- > The water is too _________ . 40. I’m sorry that I don’t have enough money to buy that coat.--- > I wish ________________

văn tả con mèo ...............cute vào.