Cho ∆ABC có góc A > 90°. lấy D∈AB, E∈ AC CMR:DE<BC

The Earth Day comes from the idea of a former US politician Gaylord Nelson. He was worried about the world pollution, and the health of plants and animals. In 1969, he decided that the world should have a special day to teach people about how to make environment better. His idea became popular and on 22 April 1970 the first Earth Day was celebrated. Since then, environmentalists have used the day to educate people about their roles in protecting our planet. Earth Day finally became a global celebration around the world. On this day, people come together to talk about global warming, protecting rare animals and saving energy sources. Question 21: The best title for the passage can be ______. A: The meaning of the Earth Day B: Gaylord Nelson, the politician C: Preserving our energy sources D: The celebration of Earth Day

22. The World Wide Web is made up of millions of ____ created by anybody from multi-media corporations to ordinary people like you and me. A. newsgroups B. chatrooms C. users D. sites 23. On the web you can read ____ newspapers or magazines; you can watch videos, download music or buy anything. A. virtual B. online C. digital D. offline 24. When I first started learning English ten years ago, I could hardly ____ a word - "hello”, “goodbye”, “thank you” was just about it! A. speak B. talk C. say D. tell

1.Sử dụng thuốc kháng sinh để tiêu diệt loại vsv nào? giải thích hiện tượng kháng thuốc kháng sinh ở vsv? 2. Tại sao các vk nguyên thủy: clamidia, ricketxi có đời sôngs kí sinh nội bào bắt buộc ( chỉ sống đc khi ở trong tb chủ) mà ko thể sống trong mt tự do (sống bên ngoài MT) như các VK khác? Mng giúp em với ạ! Đây là câu hỏi hsg nên rất mong mng giúp đỡ và cho mình câu trả lời hợp lí nhất ạ! Mình cảm ơn nhiều^^

C1 ........... many books are there? - There are five books. C2. I am .......... soccer now. C3. How .......... Mr Ba travel to Ho Chi Minh City? C4. My sister always ........... her teeth after dinner. C5. That is Ba .......... father is a doctor. C6. This is .......... new classmate. C7. .......... is your classroom? - It is on the fist floor. C8. Are there ........... trees near your house? C9. .......... he .......... a truck to Ha Noi at the moment?

Nam bought this book yesterday. 1 điểm A. This book is bought by Nam yesterday. B. This book was bought yesterday by Nam. C. This book has been bought by Nam yesterday. D. This book was bought by Nam yesterday. We always cycled to school two years ago. 1 điểm A. We used to cycling to school two years ago. B. We used to cycle to school two years ago. C. We are used to cycling to school two years ago. D. We use to cycle to school two years ago. I find the film interesting. 1 điểm A. I am interesting in the film. B. I was interested in the film. C. I am interested in the film. D. I am interested on the film. Despite being so young, he performs excellently. 1 điểm A. Although he is so young, he performs excellently. B. Although he was so young, he performs excellently. C. Although he is so young, he performed excellently. D. Although his age, he performs excellently.

Mình muốn giải câu ở hình ảnh nhanh nhất

từ "trút " trong câu :"cây bàng đã trút hết là " thuộc loại từ nào A. Danh Từ B. Động Từ C. Tính Từ Cho câu văn :" rồi những người con cũng lớn lên và lần lượt lên đường " câu văn trên thuộc kiểu câu gì A. Câu kể ai làm gì B. câu kể Ai là GÌ C. câu kể ai thế nào Chủ ngữ trong câu bông hoa hồng nỡ rất đẹp là A. bông hoa hồng B. BÔng hoa hồng nở từ nào sau đây không đồng nghĩa với từ :"hòa bình " A. hòa thuận B. bình yên C. hiền hòa D. thái bình

tác dụng của so sánh ngang bằng

1.tìm x biết a) 5 - (10 - x) = 7 b) - 32 - (x - 5) = 0 c) - 12 + (x - 9) = 0 d) 11 + (15 - x) = 1