Cho hình chóp tứ giác Sabcd gọi MN lần lượt là trung điểm của Sa và Sc C. C/m (SAC) □ (SBD)

Các câu hỏi liên quan

giúp mình với mình đang cần gấp 1. An / A.......................is used to check people’s eyesight. A. eye-chart B. eyeglass C. stretcher D. eye-shade 2. Hoa has just burned. She has to use a towel or handkerchief to cover the........................... A. leg B. eyes C. wound D. hand 3. He always uses a.............................because he has a broken leg A. stretcher B. crutch C. scale D. wheelchair 4. Her head is bleeding very badly but she is.......................... A. conscious B. unconscious C. happy D. sad 5. .......................is a type of bed used for carrying the sick or injured people A. Ambulance B. Bandage C. Stretcher D. Crutch 6. The girl fell.......................her bike and hit her head......................the road A. of – in B. off – in C. off – on D. of – on 7. “I promise I won’t be late for school” - ................................ A. Yes, please B. That would be nice C. I hope so Tùy chọn 4 D. I’m afraid not 8. Leave the victim........................flat and don’t let him.........................cold A. lying – to become B. lying – become C. lie – to become D. to lie – to become 9. She promises...........................me up at 7.30. A. will pick B. to pick C. picks D. A & B are correct 10. She said softly so as...............................the baby up A. didn’t wake B. to not wake C. not to wake D. not waking II. CHANGE THE SENTENCES INTO PASSIVE 11. John collects money. 12. Anna opened the window. 13. They have opened a new shop 14. Rick has interviewed the lady 15. Her mother is preparing the dinner in the kitchen 16. We should clean our teeth twice a day 17. How many languages do they speak in Canada? 18. Are you going to repair those shoes? 19. Did Mary buy this beautiful dress? 20. I won’t hang these old pictures in the living room