đốt cháy 3 gam một chất hữu cơ A thu được 8,8 gam CO2 và 5,4 gam H2O a/ A có chứa những nguyên tố nào ? b/ biết phân tử khối của A nhỏ hơn 40. xác định công thức phân tử của a a có làm mất màu dung dịch Brom hay không? nếu có hãy viết pt

I. LISTENING Part 1. Listen to the news report and write T or F. 1 A typhoon hit Nghe An Province eartly this morning. ........ 2. Dozens of people were seriously injured in the storm. ....... 3. There was extensive damage to property in Cua Lo, a costal town in Nghe An. ......... Part 2. Listen choose the best answer A, B or C. 1. A powerful storm with serve...........and heavy rain. A. storm B. winds C. thunderstorm 2. Dozes of people were injured in the..........last night A. flood B. drought C. storm 3. Hundreds of other people became....... A. homeles B. homes C. home town 4. A cording to the weather bureau,........will continue over the next few days. A. strong winds B. heavy rain C. big flood II. Find the word wich has different sound in the part underlined. 1. A. twi̲ce B. fli̲ght C. pi̲ece D. mi̲nd 2. A. laughe̲d̲ B. learne̲d̲ C. playe̲d̲ D. arrive̲d̲ III. Find the word with a different stress pattern from the others in each line. 1. A. profession B. pollution C. picture D. eruption 2. A. economic B. volcanic C. artistic D. historical IV. Choose the best option (A, B, C or D) to complete the following sentences. 1. Our city is suffering_________different kinds of pollution: water, air and noise. A. to B. with C. from D. on 2. Several tropical storms______our country recently. A. struck B. have struck C. are striking D. strike 3. The victims on the roofs of the houses______with food and water by the rescue team. A. provided B. will be provide C. were provided D. had provided 4. If we______soon, the pollution will get much worse. A. don't act B. didn't act C. will not act D. hadn't acted 5. I learnt from the news on TV that the earthquake_______hundreds of houses. A. destroys B. were destroyed C. had destroyed D. are destroying 6. Look at your weekly schedule. Your presentation on visual pollution______at 9.45. Don't be late please. A. is starting B. starts C. had started D. has started 7. - Hi, Jane! How nice to meet you here in Manhattan! -"______." A. so am I B. Me, too C. Thank you D. the same to you 8. Eating too much sugar can______to health problems. A. cause B. lead C. make D. do V. Give the correct tense/ form of the verbs in the brackets. 1. You (not lose) ______ weight if you eat too much junk food. 2. New Zealand (divide)______into the North Island and the South Island. VI. Give the correct form of the words in brackets to complete each sentence. 1. the water______is a seriously problem of all countrie in the word. (pollute) 2. Most people had left before the volcano______ (erupt) VII. Read and complete the following passage, using the words in the box. (destructive, problems, their, to, erupts) When a volcano (1)______, hit gases and melted rock from deep within Earth find (2)______way up to the surface. This material may to follow slowly out of a crack in the ground, or it may explode suddenly into the air. Volcanic eruptions may be very (3)______. But they can also create new landforms. Of the nearly 1,900 volcanoes active today, or known to have been active in historical times, about ninety per cent be tound in the areas of South America, North America, Asia, and Oceania that are close (4)______the Pacific Ocean. VIII. Read the passage and answer the questions. There are three main kinds of pollution-air pollution, water pollution, and noise pollution. Air, wich is the most important element of our environment for our survival, can be polluted in many ways. China, the USA, Russia, India, Mexico, and Japan are the world leaders in air pollution emissions. Water is also polluted by the discharge of commercial and industrial waste intro surface water. Sewage in drinking water is another cause of water pollution as it contains germs and viruses. The noise of vehicles, mills, and factories can be really unbearablem This kind of constant sound also causes headaches, tension, mental stress, and migraines. People living next to a building site where there is too much noise can become sick, as they cannot sleep or relax. This is called noise pollution. 1. How many main kinds of pollution are there? _________________ 2. Which is the most important element of our environment for our survial? _________________ 3. Are China, the USA, and Japan the world leaders in air pollution emissions? _________________ 4. Why people living next to a building site where there is too much noise can become sick? _________________ IX. Rewrite the following sentences without changing their original meanings. 1. I'm not you, but I think you should recycle these plastic carrier bags. -> If I were_________________ 2. If he doesn't work hard, he will not pass his exam. -> Unless_________________ 3. The pilots suddenly went on strike, so all filghts had to be cancelled. -> Because_________________ 4. Someone has stolen by bicycle. -> My bicycle_________________

V. Find and correct themistakes 1. The flight to Vientiane havedeparted 2.She hasn't finish theletter 3.I forget that girl's name already 4. Fred's brother just graduates fromuniversity 5.I am trying to lean English foryears

Rừng nước ta bị tàn phá nghiêm trọng việc khoanh nuôi rừng nhằm mục đích gì đối tượng nào được khoanh nuôi

Hmu hmu =( Mai thi Gặp pà cô ghê nhất trường chông :') Sohaicacthu :'<< Vẽ chibi sohai :(

Cảm nhận về sự đặc sắc của câu thơ những luồng run rẩy rung rinh lá

ai giup mik làm mấy câu này với mik sẽ vote 5 sao ch o

giải hệ phương trình: x-y = 5 x+y = 75

giúp mình với hứa cho ctlhn, sắp xếp nha 1.We’re / time ./ great / here / having/ a / in Cambodia. ………………………………………………….…………………………………………………. 2.The / lovely / weather / has been. ……………………………………………………………………………………………………. 3.house / have /My / will/ future/robot/ a/ ………………………………………………….…………………………………………………. 4. local / friendly / The / are / people. ……………………………………………..…………………………………………………. 5.We’ve / Angkor Wat and Angkor Thom / visited. ……………………………………………………………………………………………………. 6. something / to / you / Would / drink / like / Jane? ………………………………………………….…………………………………………………. 7. I/ went/ Ha Long Bay / to / last/ summer / with / my parents. …………………………………………………………………………………………………… 8. 19/ May / born / on / Uncle Ho / 1890 / was. ………………………………………………….…………………………………………………. 9. classrooms /are / school / How / there / many / in / Lan’s? …………………………………………………………………………………………. 10.I / going / am / a / watch/ football/ to /TV/ match / on / evening / this. ………………………………………………….………………………………………………….

câu 1: phân tích hiệu quả phép so sánh "Chú bé loắt choắt các chân thoăn thoắt cái đầu nghênh nghênh ca nô đội lệch mồm huýt sao vang như con chim trích nhảy trên đường làng