Câu 20: Dẫn 5,6 lít anken X qua dung dịch brom dư thấy khối lượng bình brom tăng 14 gam. CTPT của anken là: A. C4H8. B. C4H10. C. C5H10.

Vấn đề về biển ?????Tại sao bảo vệ tài nguyên và môi trường biển??

So sánh các cạnh của tam giác ABC biết : góc ngoài tại đỉnh A bằng 120 độ, góc B bằng 54 độ Giúp mình nha! Mình đang cần gấp

Hai thửa ruộng thu hoạch được 3tân 2 tạ thóc.thưa ruộng thứ nhất nhiều hơn thửa ruông thứ hai 6 tạ . Hỏi mỗi thưa ruộng thu hoạch được bao nhieu kg thóc

X. Rewrite each of the following sentences so that it means the same as the first one, beginning with the givenwords. (2.0pts) 1. Her book is not the same as mine.  Her book ................................................................................................................... 2. It isn’t necessary for students to wear uniforms on Wednesday.  Students don’t ........................................................................................................... 3. She teaches English well.  She is......................................................................................................................... 4. It took us a whole day to look for these old pictures.  We spent .................................................................................................................. 5. What is the distance between your hometown and your school?  How ....................................................................................................................... ? 6. Mr Thanh couldn’t enjoy the meal because of the stomachache.  The stomachache prevented ..................................................................................... 7. He is a slower and more careful driver than I am.  He drives .................................................................................................................. 8. He preferred oranges to durians.  He liked .................................................................................................................... 9. Zidane is among the greatest football players in the world.  One of the ................................................................................................................. 10. Why didn’t you come to class last Monday?  Why were................................................................................................................

Mn ơi giúp em em cần nộp gấp ạ

IV. Fill each blank in the following passage with a suitable word from the box.    untidy      are      not      near      next      on      his      bag  An's bedroom is big but messy. There ...(1)... clothes on the floor. There is a big desk ...(2)... the window, there are dirty bowls and chopsticks ...(3)... it. He usually puts his school ...(4)... under the desk. His bed is ...(5)... to the desk, and it is also ...(6).... There is a cap, some CDs and some books on the bed. An's Mum is ...(7)... happy with this, and how An is tidying up ...(8)... room. V. Read the passage and choose the best word (A, B or C) to put in each space.   I am a ...(1)... in a house. Every day, members in the family take a ...(2)... in me. They brush their teeth, wash their ...(3)..., and ...(4)... dressed every morning. I usually get wet on my floor. Who I am? I am a ...(5).... 1/ A. corner B. box C. room 2/ A. break B. bath C. rest 3 A. eyes B. faces C. teeth 4/ A. put B. take C. get 5/ A. bedroom B. kitchen C. bathroom

help :sự kết hợp của những quá trình nào đã giải thích cho khẳng định : gen gián tiếp quy định các tính trạng của sinh vật

Câu 18: Đốt cháy một hỗn hợp hiđrocacbon ta thu được 2,24 lít CO2 (đktc) và 2,7 gam H2O thì CTPT của hiđrocacbon là A. C2H4. B. C2H6. C. C2H2. D. C3H6. Câu 19: Đốt cháy hoàn toàn một hiđrocacbon X thu được 0,11 mol CO2 và 0,132 mol H2O. Khi X tác dụng với khí clo thu được 4 sản phẩm monoclo. Tên gọi của X là A. 2-metylbutan. B. pentan. C. 2,2-đimetylpropan. D. 2-metylpropan

VI. Fill in the blanks with the correct form of the words in capital letters. (2.0pts) 1. Some programs on TV are becoming very……… with children. POPULARITY 2. Clair is very…………., she knows a lot of people. SOCIETY 3. I am an ……. person. I play a lot of sports and run every day. ENERGY 4. The president will make a ……….. tonight. SPEAK 5. I understand………. what you are saying. CLEAR 6. Artists are ……… people. CREATE 7. My father has a …………computer. He often brings it with him when he’s away on business. PORT 8. We are all ………..about going on an excursion to Cuc Phuong forest next weekend. EXCITE 9. Some of the children …………….boys, play marbles when there is a break. MAIN 10. We mustn’t be …………………………………….…….when we cross busy streets. John Smith is a very busy man. He is 60 years old and he has a lot of jobs. He is a policeman, a 11. fireman, a school CARE