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tranchithuan
2 năm trước
Tính khối lượng của proton, nơtron, electron có trong 5,6 lít khí clo (đktc). Biết rằng 1 nguyên tử clo có 17 proton và 18 nơtron.
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Nguyễn Hiền nhà rất nghèo, phải xin làm chú tiểu trong chùa. Việc chính là quét lá và dọn dẹp vệ sinh. Nhưng cậu rất thông minh và ham học. Những buổi thầy giảng kinh, cậu nép bên cửa lắng nghe, rồi chỗ nào chưa hiểu, cậu hỏi thầy giảng thêm. Thấy Nguyễn Hiền thông minh, mau hiểu, thầy dạy cho cậu học chữ. Không có giấy, Nguyễn Hiền lấy lá để viết chữ, rồi lấy que tre xâu thành từng xâu ghim xuống đất. Mỗi ghim là một bài. Một hôm Nguyễn Hiền xin thầy cho đi thi. Thầy ngạc nhiên bảo: - Con đã học tập được bao nhiêu mà dám thi thố với thiên hạ? - Con xin thi thử xem sức học của mình đến đâu. Năm ấy, Nguyễn Hiền đã đỗ Trạng nguyên. Vua Trần cho Nguyễn Hiền còn nhỏ quá, mới 12 tuổi, nên không bổ dụng. Một thời gian sau, vua có việc tiếp sứ giả nước ngoài, cho gọi Nguyễn Hiền về triều. Nguyễn Hiền bảo: - Đón Trạng nguyên mà không có võng lọng sao? Ông về tâu với vua xin cho đầy đủ nghi thức. Vua đành cho các quan mang võng lọng rước quan Trạng tí hon về kinh. (Theo Cửu Thọ, Một trăm gương tốt thiếu nhi Việt Nam, NXB Trẻ, TP Hồ Chí Minh, 1999) Câu 1. Xác định phương thức biểu đạt chính của văn bản trên? Câu 2. Em hãy tìm những câu văn ca ngợi đức tính ham học hỏi của Nguyễn Hiền? Từ đó, em học tập được điều gì qua câu chuyện?

. The wall is wet. It ______. A. has just been repainted B. is repainted C. is being repainted D. will be repainted 2. It’s nice I am now in London again. This is the second time I _______ there. A. will be B. would be C. was D. have been 3: We ______ in Newcastle for three years now and like it a lot. A. have lived B. had lived C. live D. lives 4. The number of students ________ very hard recently . A. have worked B. has worked C. have been working D. has been working 5. Everyone is aware that it will be much safer to ______ walkways and underpass systems for pedestrians. A. have elevated B. be elevated C. elevate D. Elevating She me the same question three times since yesterday. A. asks B. asked C. have asked D. . has asked 6.Three new buildings _________ in the village recently. A. have been built B. were built C. have built D. built 7.This is the first time I __________ the experiment on plant breeding. A. did B. do C. would do D. have done 8 My sister _________in the bank for five years before she was sent to Da Nang. A. has worked B. was working C. had worked D. works 9.Conical hat making ________ a traditional craft for hundreds of years. A. is B. are C. has been D. have been 10. Gathering of over 20 people ____________ in Vietnam since the new wave of the pandemic. A. has been forbidden B. has forbidden C. forbids D. is forbidden 12. This is the first time I ______ this Shakespeare’s novel. A. have read B. read C. reading D. to read 13. We spent a year building this house and we ________ it recently. A. have finished B. finished C. had finished D. finish 14. This is the first time John ____ Chinese food. A. has eaten B. eats C. ate D. is eating 15. Everything is going well. We ………. any problems with our business so far. A. haven’t had B. don’t have C. didn’t have D. won’t have 16.He………..his homework before he went out last night. A. finished B. finish C. had finished D. finishing 17. By the time Alex finished his studies, he ________ in London for over eight years. A. was B. had been C. has been D. was living 18. He .........................the house by the time his mother came back. A. had cleaned B. had clean C. has cleaned D. cleaned 19. My father had already cooked the dinner when we ……..…. home. A. to come B. came C. had come D. were coming 20. After I ______ lunch, I looked for my bag yesterday. A. had had B. have had C. has had D. had 21. My sister ..............in the bank for five years before she was sent to Da Nang. A. works B. was working C. has worked D. had worked 22. She said to me that she __________ to me the Sunday before. A. had written B. has written C. was writing D. wrote 23. The building ………………before they went abroad. A. had sold B. has been sold C. was sold D. had been sold 24. After he ______ his homework, he went to bed. A. had finished B. finished C. has finished D. finishes 25. After they ____ their breakfast, they ____ shopping yesterday. A. had had/ went B. had had/ go C. had/ had gone D. have/go 26. When we arrived at the station, the train ______. A, would go B. . had gone C. went D. has gone 27. Before you asked yesterday, the letter ________ already. A. had been written B. was written C. had written D. has been written 28. Mai didn’t hear the phone. She _______. A. was sleeping B. Sleeps C. Slept D.used to sleep 29.She often ____________her children by telling them stories before they go to bed. A. entertain B. entertains C. entertainment D. entertainer 30. I ______ home until I finish today’s work. A. won’t go B. haven’t gone C. didn’t go D. don’t go 31.When he came, we______dinner. A. will have B. had C. were having D. had had

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