Cho a, b, c, d là các số nguyên dương thoả mãn: ab = cd a. Chứng minh a = xy, c = xz, b = zt, d = yt trong đó x = (a, c) b. Chứng minh a + b + c + d là một hợp số

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Đun nóng 8,8g A với dung dịch NaOH cho đến khi kết thúc phản ứng thì được 9,6g muối. Công thức cấu tạo của A là: A. CH3CH2CH2 COOH B. CH3 COOC2H5. C. CH3COOC2H3. D. CH3 CH2 COOCH3

Reading comprehension A. Read and decide if each statement is true (T) or false (F). My name is Elena and I’m a pupil of Green School. My school is in Orange Street. I am twelve years old. I would like to tell you a few words about my school life. I go to school five days a week except Saturday and Sunday. Classes in my school start at 8 o’clock in the morning and end at 15.30. I often have 6 or 7 lessons a day. I study a lot of different subjects: English, History, Geography, Biology, Physics, Chemistry, Math, etc. I like English because I can learn lots of interesting things in England. I usually receive good marks in this subject. I wish to become an English teacher in the future. This is my school. It was built about ten years ago. My classroom is on the third floor. Its windows face the school-yard. There are two large windows in my classroom; a great amount of flowers grow in pots that stand on the window-sills. Pupils in my class are responsible for watering the flowers several times a week. And I all do it with great care and pleasure. On the walls of my classroom there are different colour maps, portraits, and wall newspapers. My school has a stadium, a library, a gym and a computer room, too. I love my school so much 1. Elena is a pupil at Blue School. _________ 2. She goes to school five days a week. _________ 3. Her school starts at 8.00 a.m. and finishes at 3.00 p.m. _________ 4. She learns different subjects at school. _________ 5. Maths is her favourite subject. _________ B. Choose the letter A, B, C or D to answer these questions Hi. My name is Mary. I’m twelve years old. I’m a pupil. I live in a beautiful area in a big city. Every morning I get up at 5:30 o’ clock. After that, I dress up, have breakfast and go to school. My school is not very far from my house so I often go to school on foot. But today I ride my bike because I want to attend my English class after school. I love English so much. I will study abroad soon. 1. What does Mary do? A. a teacher B. a farmer C. a student D. a driver 2. What time does she get up in the morning? A. half past five B. five forty-five C. a quarter to six D. six o’clock 3. What subjects does she like? A. Geography B. Literature C. English D. Both B & C 4. Is her school far from her house? A. Yes, it is B. No, it doesn’t C. No, it isn’t D. Yes, it does 5. Does she play soccer after school? A. Yes, she is B. No, she doesn’t C. No, she don’t D. Yes, he does

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