Có 2 thanh kim loại đồng và kẽm có khối lượng bằng nhau. Hỏi thanh nào chứa nhiều nguyên tử hơn? Giải thích?

Lập dàn ý về nhân vật hiên trong ''gió lạnh đầu mùa''

xin giúp em ạ, cần trợ giúp gấp, pls <3

Giúp mình 2 câu này ko cần giải thích, đáp án thôi

nêu các thuộc tính của âm thanh

giúp mk nhanh đi ạ mk cảm ơn trước

Cho hàm số y=f(x) co f'(x)=2x(2x+1)^3(1-4x^2) hàm số đồng biến trên

Hoa new school is from here old school a là far b là different c là nice đ là meet

Lớp 7A, 7B, 7C quyên góp được 156 quyển sách cũ. Tìm số sách mỗi lớp biết rằng số sách tỉ lệ với 2;3;7

VII. Choose the correct answer A, B, C or D to fill each blank in the following passage. Hobbies are activities for entertainment. Hobby can cost you almost nothing. Music is the most popular. For example, many people play the guitar for (66) in their free time. Sports provide other (67) hobbies. Cycling, running, tennis, table-tennis are the sports that millions of people play during their free time. Some people’s coin collections are wonderful. There are still hundreds of (68) collections, such as bottle collections, seashell collections, butterfly collections, and so on. For some people, a hobby is a favourite (69) , like chess. In chess, we need two or more people (70) . 66. A. fun B. funny C. funnies D. funniest 67. A. strange B. normal C. favourite D. unusual 68. A. another B. other C. others D. the other 69. A. exercise B. game C. interest D. sports 70. A. play B. to play C. playing D. to playing VIII. Read the passage, and then decide whether the statements are true (T) or false (F). Volunteering is one of the things that are very useful to you. To your future bosses, volunteer work shows that you are interested in both the world and your future. Although volunteer work does not bring you money, it gives you a time to learn social skills and make a difference in our community. Volunteers have the chance to teach English, arts, and sports for homeless children. They also help children with health problems, especially children who cannot see, hear and speak. True False 71. Doing volunteer work is very useful to you.   72. Volunteering is good for your future job.   73. You can earn a lot of money from volunteering.   74. Volunteers can help homeless children to learn English, arts, and learn   how to play sports. 75. Volunteers only help healthy children.   IX. Read the following passage carefully, and then answer the questions. We send young people of different nationalities on expeditions around the world. Our volunteers get the chance to work with local people to learn about different cultures. There are ten expeditions every year. Each expedition lasts for ten weeks and takes 150 volunteers. They go to countries such as Chile, Namibia, Mongolia and Viet Nam. Some of our volunteers work with local people to provide facilities, for example, building schools. Others work in national parks or help scientists to do environmental research. These adventurous, young people come from all over the world. To become a volunteer, you have to be between 17 and 25; you have to speak some English and you also have to be enthusiastic, flexible and hard-working members of a team. 76. Who goes on the expeditions? 77. How many .expeditions are there every year? 78. How long does each expedition last? 79. What do the volunteers help scientists? 80. Which language must we know to become a volunteer?