Chín hợp tử của cùng một loài nguyên phân một số lần bằng nhau tạo ra các tế bào con, trong các tế bào con chứa tổng 14400 NST. Trong quá trình phân bào, môi trường nội bào đã cung cấp 13500 NST được cấu tạo từ nguyên liệu mới hoàn toàn. Theo li thuyết, hãy xác định số lượng NST có trong tất cả các tế bào khi đang ở kì giữa của lần nguyên phân cuối cùng

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I. PRONUNCIATION: 1. A. appointment B. cavity C. dentist D. harvest 2. A. helpful B. hygiene C. iron D. canteen 3. A. painful B. forget C. sensible D. serious 4. A. surgery B. tidy C. healthy D. remember 5. A. hungry B. thirsty C. tired D. favorite 6. A. healthy B . orange C. tomato D. coffee 7. A. afternoon B. dinner C. onion D. vegetable 8. A. banana B. matter C. apple D. lettuce 9. A. carrot B. hungry C. breakfast D. potato 10. A. healthy B. engineer C. worker D. personal II. MULTIPLE CHOICE: 1. He ________ very happy yesterday. a. is b. were c. was d. are 2. Sorry! I’m busy today. I have an ______ with my doctor at 8 o’clock. a. occasion b. opportunity c. activity d. appointment 3. You should wash your hand ______ meals. a. after b. in c. before d. at 4. I’m glad______ you’re feeling better. a. hear b. to hear c. hearing d. hears 5. ______ does Minh feel nervous ? Because he is seeing the dentist. a. How b. Why c. What d. When 6. You looks tired. What’s the ______ with you ? a. matter b. happen c. wrong d. right 7. Minh is absent from class today ______ he is ill. a. but b. because c. when d. so 8. Thanks a lot. - __________ a. I’d love to b. That’s right ! c. That’s OK. d. Good luck ! 9. I ______ to see you tomorrow. a. enjoy b. hope c. know d. think 10. Few people like ______ on the farm. a. work b. to work c. working d. b&c 11. ______ are her parents busy now ? a. why b. who c. what d. when 12. Every day, I get up early to ______ morning exercises. a. do b. take c. make d. a&b 13. Her parents are pleased ______ she is taking morning exercise now. a. so b. because c. because of d. why 14. We ought not to eat too much candy because it’s bad ______ us. a. with b. of c. at d. for 15. Her mother wanted her ______ up early. a. get b. to get c. getting d. to getting 16. I think you don’t have to worry ______ that. a. of b. to c. for d. about 17. The dentist smiled ______ him kindly. a. with b. at c. to d. on 18. I have toothache so I’m going to the ______. a. nurse b. doctor c. dentist d. teacher 19. I am always nervous before the test. a. worried b. pleased c. serious d. glad 20. “What happened to you ?” –“__________”. a. I feel tired b. I’m free now c. Not at all d. I’d love to