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truongmeo180901
2 năm trước
Giúp e và giải thích hộ em vs, e cảm ơn nhiều ạ -Một giống lúa A cho năng suất cao nhưng có thời gian sinh trưởng dài. Hãy trình bày các bước cải tiến giống lúa A để có được giống cho năng suất cao và thời gian sinh trưởng ngắn bằng phương pháp gây đột biến nhân tạo
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bài 6 4. Choose the correct answer. 1. Was Tom there when you arrived?” - “Yes, but he home soon afterwards.” A. goes B. went C. had gone D. were going 2. Before Jennifer won the lottery, she any kind of contest. A. hasn’t entered B. doesn’t entered C. wasn’t entering D. hadn’t entered 3. “Who was the woman in red dress? Did you know?” - “No, I who she was. I her before.” A. didn’t know - hadn’t seen B. didn’t know - hasn’t seen C. hadn’t known - hadn’t seen D. don’t know - hasn’t seen 4. It’s two years Joe. A. that I don’t see B. that I haven’t seen C. since I didn’t see D. since I saw 5. The man sitting next to me on the plane was nervous because he before. A. hasn’t flown B. didn’t fly C. hadn’t flown D. wasn’t flying 6. They in Scotland for ten years. Now they live in London. A. lived B. have lived C. has been living D. had lived 7. As soon as Laura the house, it started to rain. A. has left B. was leaving C. had left D. had been leaving 8. Sorry we’re late, we the wrong turning. A. had taken B. were talking C. took D. are talking 9. We in New York for ten years and then we here in 1987 A. have lived - moved B. lived - moved C. lived - had moved D. had lived – moved 10. When Martin the car, he took it out for a drive. A. had repaired B. has repaired C. repaired D. was repairing 11. We them before the reception yesterday. A. haven’t met B. hadn’t met C. didn’t meet D. wouldn’t meet 12. Karen didn’t want to come to the cinema with us because she the film. A. has already seen B already had seen C. had already seen D. saw 13. The man looked familiar. I him somewhere before. A. saw B. have seen C. had seen D. see 14. Last night a tornado swept through Rockville. It everything in its path. A. destroyed B. was destroyed C. had destroyed D. has destroyed 15. When we the bill, we left the restaurant A. had paid B. were paying C. paid D. had been paid

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