1, Giải thích vì sao ở các loài giao phối rất khó tìm thấy hai cá thể giống hệt nhau hoàn toàn trừ sinh đôi cùng trứng 2,Giả sử người nói trên hô hấp bình thường là 18 nhịp/1 phút, mỗi nhịp hít vào một lượng khí là 450 mililít (ml). Hãy tính lượng khí CO, (theo đơn vị lít) mà người đó đã thải ra môi trường bằng con đường hô hấp trong một ngày. 3. Giải thích vì sao tim đập liên tục suốt đời không mệt mỏi?

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III. Rewrite each sentence, beginning as shown 1. If I had known she was sick, I would have visited her. => Had……………………………………………………………………… 2. If the train should be delayed, I shall send the telegram. => Should…………………………………………………………………… 3. Supposing it were true, how would we laugh? => Were…………………………………………………………………….. 4. If I met the author one day, I would ask him to sign my copy of his new book. => Were I……………………………………………………………………… 5. Please let me know if you wish to keep the books any longer. => Should you………………………………………………………………… 6. If I were the Prime Minister, I would reduce taxes. => Were……………………………………………………………………… 7. I can meet you if you arrive before eleven. => So………………………………………………………………………… 8. Your car may break down on the rough mountain road, so take plenty of spare parts. => In case…………………………………………………………………… 9. Without this treatment, the patient would have died. => If it……………………………………………………………………… 10. You should take a map because you might get lost in those mountains. => In case………………………………………………………………… 11. Without his help we would all have died. => If it…………………………………………………………………… 12. Provided your handwriting is legible the examiner will accept your answers. => So long as the examiner……………………………………………… 13. If she hadn’t insisted on kissing everyone goodbye she would have caught the train. => If it hadn’t…………………………………………………………… 14. It was the goalkeeper who saved the match for us. => If it hadn’t…………………………………………………………… 15. If you persist in defying instructions, we’ll be forced to act. =>Should …………………………………………………………