5 sao lun : IX Read the passage. There are three main (1) ……………… of pollution: air pollution, water pollution and noise pollution. Air, which is the most important element of our environment for our (2) ……………………, can be polluted in many ways. Smoke in the air from mills, factories and industry (3) …………………… carbon, monoxide, carbon dioxide, and methane, which are all poisonous gases. This leads (4) …………………… health problems like asthma and lung diseases, and the thinning of the ozone layer, which (5) …………………… us from harmful UV ray. China, the USA, Russia, India, Mexico and Japan are the world leaders in air pollution (6) …………………… Water is also polluted by the discharge of commercial and industrial waste. Sewage in drinking water is another (7) …………………… of water pollution as it contains germs and viruses. The noise of vehicles, mills, and factories can be really unbearable. This kind of constant sound also (8) ……………… headaches, tension, (9) ……..………… stress and migraines. People living next to a building site where there is too much noise can become sick, as they can not sleep or relax. This is (10) …………………… noise pollution. Choose the best answer (A, B, C or D). 1. A. types B. kinds C. models D. both A & B 2. A. survival B. survive C. surviving D. survived 3. A. includes B. include C. contains D. contain 4. A. in B. into C. to D. from 5. A. prevents B. protects C. avoids D. hides 6. A. emissions B. emitted C. emission D. emitting 7. A. effect B. cause C. result D. consequence 8. A. causes B. leads to C. results in D. all are correct 9. A. brain B. mind C. head D. mental 10. A. told B. called C. said D. mentioned Answer the questions below. 1. What are the examples of health problems caused by air pollution? 2. Why is sewage in drinking water another cause of water pollution? 3. What does the writer says about the noise of vehicles, mills and factories? X Read the passage. Answer the questions below. Scientists have discovered that the ozone layer is getting thinner. Some predict that the sun’s rays will cause a sharp increase in deaths from skin cancer over the next fifty years. These harmful rays can also damage the eyes, create wrinkles, and cause other health problems. The stratosphere contains a form of oxygen called ozone. Ozone is a molecule composed of three oxygen atoms. The chemical formula of ozone is 03. Oxygen molecules make up about 21% of all gases in the Earth’s atmosphere. They consist of two atoms of oxygen and are labeled 02. Most ozone found in our atmosphere is formed by an interaction between oxygen molecules and ultraviolet radiation (UV) from the sun. When ultraviolet radiation hits an oxygen molecule, it may cause the molecule to break apart into single atoms of oxygen. These single atoms are very reactive, and a single oxygen atom can combine with a molecule of oxygen to form ozone. 1. What do people say about the rate of deaths from skin cancer in the future? 2. How many oxygen atoms are there in a molecule? 3. What elements participate in the formation process of ozone? 4. What happens when an oxygen molecule and an ultraviolet radiation hit each other? 5. What is the feature of single atoms?

4: Trên mặt phẳng có 4 đường thẳng. Số giao điểm của các đường thẳng có thể là bao nhiêu? ( Xác định và vẽ các trường hợp có thể xảy ra) Giúp mik nhaaaa

Trình bày chiến thắng Cầu Giấy lần 1,lần 2 và nêu ý nghĩa P/s: các bn giúp mk, mk vote 5 sao nha!!!!!

Giúp mk bài 2 ,3,4 mk cảm ơn ạ mk sẽ vote 5 sao

giải phương trình 5x^3+6x^2+12x+8=0

Giải hộ mình bài 14 nha. Cảm ơn!

Ai là bạn giúp mình bài này với mình cần gấp

em hãy chứng minh rằng tục ngữ là 1 kho tàng kinh nghiện quý báu mà ở đó cha ông ta đã đúc kết những chân lí nghìn đời về mọi mặt của cuộc sống

II. Supply the correct form or tense of verbs in the brackets: 35. Marconi (invent) ________ the radio. 36. The children must (be) _____________ back by six o’clock. 37. I like (watch) _________ baseball. 38. My mother (not like)________ riding. She (prefer)________ walking. 39. When my father (be)_________ young, he (drink) ____________ a lot of wine. 40. Lan’s family always (watch) __________ TV in the evening. 41. I’d like (tell)_________ you something about myself. 42. many years ago, most people in Vietnam (not have)________ VT sets 43. Nga likes (watch) ________ programs about teenagers in other countries. 44. They(perform) _________ “Romeo and Juliet” last Sunday. 45. We prefer (gather) _______ around TV after dinner. 46. Be careful! The car (come)_____________. 47. Don’t forget (turn off) ________ the lights before going out. 48. Children should (spend) ________ only a small part of their free time (play)___________ video games 49. I like (play) ____________ chess. 50. Hoa rarely (go) ___________ to the movie or (eat)__________ out in the evening. 51. Nam likes (watch) ________ videos in his free time. 52. the police can (identify) _______ the robbers by studying the video. 53. She prefers (socialize) ________ with her friends. 54. Marie Curie (receive)__________ the Nobel Price for Chemistry in 1911. 55. My uncle (send) ______ me postcards every time he (go) _______ away. 56. Ban ad Hoa would like (visit) ______ Hong Kong 57. We can (enjoy) ___________ traditional music. 58. She (learn) ___________ to play the piano when she (be)_______ six years old. 59. He (pay) __________ for his own education at Cambridge University and later he (teach) __________ at this university 60. When ____ Thomas Edison (die) ______? – in 1931 61. I (remember) _________ he (be)___ 42 when the People’s Army of Vietnam (win) ________ the battle in 1945 62. When they (be) _______ young they (leave)___________ their family and (go)________ to Ho Chi Minh City. 63. He (become)________ most famous for the fairy tale he (write) ______ between 1835 and 1872. 64. We (be) ________ at the seaside for ten days last summer. 65. She (see) ________ a movie tonight. 66. They (rehearse) ______ a new play at the moment. 67. You (meet) ________ your friend at the airport tomorrow? 68. The students (not do) ______ their homework now. 69. (Not shout) _________ . Our teacher (come)____________. 70. They (buy) __________ a lot of souvenirs for their parents yesterday. 71. The children (wait) _______ for their parents now? 72. People (sell) ________ out all the newspaper this morning 73. I (study) _______ French next month. 74. Tom (not be) _________ at home last night. He (go)_______ to his English club. 75. My uncle (raise)_________ lots of chickens and pigs at the moment. 76. Where your teacher (be)___? –He (explain) ____ a new lesson in that classroom. 77. I (pick) _____ you up at your hotel in half an hour. 78. Let’s (eat)________ some spinach. 79. Would you like (come) _______ to my house for lunch? 80. Don’t make noise! My favourite bands (perform) _______ the latest songs.

Oxit xủa 1 kim loại có khối lượng mol là 102g, rrong đó khối lượng của kim loại là 52,94%. Xđ oxit đó.