Nêu vai trò của vi khuẩn trong tự nhiên và đối với hoạt động sống của con người? (Nêu đầy đủ nha)

Cho tam giác ABC cân tại A có . Kẻ BD AC (D AC) và CE AB ( E AB). Gọi O là giao điểm của BD và CE. Chứng minh rằng : a) là tam giác cân . b) OE = OD và OB = OC c) AO là tia phân giác của góc BAC. d) OA ED

Sự ra đời của Nhà máy Cơ khí Hà Nội có ý nghĩa như thế nào

I. Find the word which has a different sound in the part underlined. 7. A. cook B. clean C. celebrate D. candy 8. A. funny B. lunch C. sun D. computer 9. A. writes B. makes C. takes D. drives 10. A. nice B. fine C. big D. light II. Odd one out 11. A. island B. building C. bay D. mountain 12. A. larger B. fast C. noisy D. cheap PART4. VOCABULARY & GRAMMAR (2,4pts) I. Choose the best answer. 13. I am ………………………than my brother. A. tall B. the tallest C. taller D. more tall 14. Children often receive ………………………….. in red envelopes at Tet. A. lucky money B. new clothes C. flowers D. cakes 15. Big cities are often very………………………., but Da Nang is quiet. A. noisy B. happy C. boring D. expensive 16. When it is cold, the students ………………………warm clothes. A. wears B. wearing C. is wearing D. wear 17. My parents always say that I ……………………… eat lots of sweets. A. should B. mustn’t C. should D. do 18. Reading a book is more interesting than watching TV. A. Watching TV is more boring than reading a book. B. Watching TV is more interesting than reading a book C. Reading a book is more boring than watching TV. II. Fill the blanks with the correct form of the verbs 19. Mrs. Mai usually………………………….(finish) her work at 5 p.m. 20. A- Where ………………………….(be) your children? 21. B- They……………………….(watch) TV in the sitting room. 22. In England the sun ……………………………………….(not shine) every day. 23. There………………..(be) a lamp, a computer and some books on my desk. 24. You must ……………..(wash) your hands before meals. PART 5. READING Read the passage then answer the questions ( 1,6pts) Phong is twelve years old. He is in grade 6. He lives in a house with his father, mother and two sisters. Their house is next to a bookstore. On the street, there is a hotel, a temple and a movie theater. In the neighborhood, there is a hospital, a factory and a stadium. Phong’s father works in the factory. His mother works in the hospital. On Sundays, Phong plays soccer with his friends in the stadium. 25. How old is Phong?................................................................ 26. Is he in grade 6?............................................................................................ 27. How many people are there in his family?.................................................................. 28. Is there a stadium or a toystore in the neighborhood?.............................. 29. Does his father work in a factory or in the hospital?............................................. 30. Does his mother work in the factory?........................................................................................... 31. Where does his mother work? 32. What does he do on Sundays?.............................................................

em hãy quan sát và ghi chép lại đặc điểm nổi bật của căn phòng em đang ở

B1: Tìm x,y biết 3/x=y/35=9/15 B2: Viết tất cả các phân số tối giản a/b (a>0,b>0) biết a.b=36

Tại sao trên bề mặt trái đất lại có nhiều khối khí khác nhau

IX. Choose the under lined word or phrase that needs correcting. (0,5pt) 1. I need two dozen of eggs, please. A B C D 2. It's ten thousands dong, please. A B C D II. Choose the best answer. (2pts) 1. He lifts heavy weights as a sport. He's a _________. A. Gymnast B. Engineer C. Farmer D. Weight lifter 2. It's a beautyful day. The sky is ________. A. Black B. Blue C. Gray D. Green 5. He is _______ between his sister and his brother. A. Sit B. Sits C. Siting D. Sitting 6. She puts her _______ over her ears. A. Legs B. Feet C. Hands D. Toes IV. Use the correct form of verb. (1pt) 1. Hoa (wait) ____________ for the bus at the moment. 2. Mr. Trung is a bus driver. He (drive) ___________ a bus. 3. The children (eat) ___________ meat every day. 4. Today, they (eat) ___________ fish now. 1. Very/ it/ and/ is/ hungry/ I'm/ 8 p.m ___________________________________________________________ 2. And/ the/ thirsty/ after/ feel/ game/ tired/ I. ___________________________________________________________ 3. Water/ isn't/ here/ there/ any. ___________________________________________________________

Bài 3: Tính: a) (3 phút 15 giây + 1 phút 20 giây) x 3 = ……………………………………… b) (9 giờ 40 phút – 1 giờ 24 phút) : 4 = ………………………………………… c) (2 phút 30 giây x 3 – 3 phút 20 giây) : 3 = ………………………………….. d) (1 giờ 15 phút + 9 giờ 20 phút : 4) x 2 = ……………………………………

Phải mất bao nhiêu phút để một xe máy đi với vận tốc 45km/giờ đi hết quãng đường dài 15km?(chỉ ghi kết quả cuối cùng)