Có 15 tế bào ban đầu nguyên phân liên tiếp 3 lần đã tạo ra các tế bào con. Hãy xác định a) Số tế bào con được tạo ra sau các lần nguyên phân b) Các tế bào con được tạo ra sau nguyên phân, nếu là tế bào sinh trứng qua giảm phân sẽ tạo ra bao nhiêu trứng? c) Các tế bào con được tạo ra sau nguyên phân, nếu là tế bào sinh tinh trùng qua giảm phân sẽ tạo ra bao nhiêu tinh trùng?

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Exercise 2. Complete the sentences with some or any. 1. There are ________ books on the shelf. 2. There isn’t _____ water in the glass. 3. Would you like _____ tea? 4. There isn’t ______ information in this book. 5. Do you need _______help? 6. Give me _______ color pencils to draw a picture. 7. I heard ______ good news yesterday. 8. We didn’t learn ______new grammar rules at the English lesson yesterday. 9. Did you see _______children in the playground? 10. There aren't _______ boys in the hall. 11. They have _______pretty dresses in the store. 12. Don’t tell me ______ bad news. 13. Did she tell you about _____ of her experience. 14. The baby is asleep. Don’t make _______ noise. Exercise 3. Choose the correct answer. 1. I eat_____ meat. I prefer fish. А. very few B. a few C. very little 2. Has he got many interesting books in his library? А. a little B. much C. a lot 3. She doesn’t eat ______ chocolate because she doesn’t like it. А. much B. a lot of C. little 4. There are ________apples on the plate. Take one. A. a few B. a lot C. a little 5. You haven’t got _______ mistakes in your test. A. a few B. a lot C. many 6. There is ______ milk in the fridge. Can you buy some? A. a few B. a little C. little 7. Put _______sugar into your tea. A. a few B. a little C. little 8. Very _______ pupils in our class can do such difficult sums. A. a few B. few C. little 9. There are ________ of shops and restaurants in our district. A. a few B. a lot C. many 10. There are _________ of mushrooms in the forest this year. A. a few B. a lot C. a little 11. I can speak English _________, but not very much. A. a few B. a lot C. a little 12. There is _______ furniture in the house; it’s almost empty. A. little B. a little C. few