Hệ hô hấp của cá: Hô hấp bằng mang.
Hệ hô hấp của ếch đồng: Hô hấp bằng phổi và da.
*Chúc bạn học tốt! ^^
- Cá : hô hấp bằng mang
-Ếch : hô hấp bằng da và phổi
Hợp chất 2,3-đimetylbutan khi phản ứng với Br2 theo tỉ lệ mol 1:1 (có ánh sáng) sẽ thu được số sản phẩm là
Cho tam giác ABC có MN//BC ( M thuộc AB, N thuộc AC). Gọi I là trung điểm MN. Kẻ AI cắt BC tại K. Chứng minh K là trung điểm BC.
Viết bài văn thuyết minh về sự nguy hiểm và cách phòng chống đại dịch covid 19 Các thiên tài ơi giúp mk vs ạ Tất cả câu trả lời đều vote 5*,câu tl hay nhất nhé
Một lớp học tham gia trồng cây ở một Lâm Trường trong một thời gian dự định với năng suất 300 cây/ngày. Nhưng thực tế đã trồng thêm được 100 cây/ngày. Do đó đã trồng thêm được tất cả là 6 cây và hoàn thành trước kế hoạch một ngày. Tính số cây dự định trồng
I, Adj or adv? Circle the correct work in each pair. 1. Edward felt sleepy/sleepily after the big meal. 2. The theater got quiet/quietly when the movie began. 3. Leroy smiled cheerful/cheerfully when the teacher gave him his grade. 4. That car looks quite comfortable/comfortably. 5. She tasted the spaghetti careful/ carefully because it was very hot. 6. He grew more and more angry/angrily as she told him the story. 7. Marsha signed heavy/heavily at the thought of all the work she had to do. 8. A trip to the country sounds wonderful/wonderfully. 9. They sounded the alarm loud/loudly when they smelled the smoke of the fire. 10. When her dog died, she cried very hard/hardly for half an hour. 11. We haven't cleaned the floor proper/properly. It is still dirty/dirtily. 12. The sun was shining bright/brightly when we arrived at the beach. 13. There was a terrible/terribly accident on this road two days ago. 14. Rose seemed very unhappy/unhappily. She smiled sad/sadly at me when she saw me. 15. He plays the piano very good/well for someone of his age. He is good/well young pianist
Ac giúp em với ạ! Cảm ơn nhiêu ạ....
Oxi hóa hoàn toàn 4,02 gam một hợp chất hữu cơ X chỉ thu được 3,18 gam Na2CO3 và 0, 672l khí CO2. Xác định công thức đơn giản nhất của X
Rút gọn biểu thức . Bài 2 phần b
1. Complete these sentences with the correct form of the word in bracket. 1. Lan looks more ……………than her sister (beauty). 2. A dog has bitten Hung, so he needs an anti – tetanus ……….. (inject). 3. Scientists have succeeded in finding a more effective ………. for this cancer (treat) 4. The injured woman was carried out of the accident on a ………. (stretch) 5. Environmentalists are doing everything to ………… the impact of the oil spin (minimum) 2. READING Life is changing rapidly in the large cities of England. However, life in other areas remains much the (1) ……. as it has been for centuries. Factories have brought huge population increases to the cities, and city life boomed. City residents have discovered a new (2) …… of life, but in country villages the traditional lifestyle has remained nearly (3) ….There have been a few changes, particularly the new steam-powered machinery. It made farm production more (4)……. But for the people who remain in the countryside, daily life continues much as it had before the (5)…….. Revolution. Life in country villages continues to (6) …… at a slow pace. The daily schedule depends on the times that the sun rose and set and on the weather. In a typical village, the (7) …… number of workers is still employed in agriculture or in domestic service. A smaller number of people work in various trades. Even (8) ……work in the professions. a. Choose the most suitable word to fill in the blank 1. A. similar B. same C. different D. difference 2. A. method B. walk C. way D. path 3. A. changeful B. changeable C. unchanged D. change 4. A. efficient B. efficiently C. efficiency D. inefficient 5. A. Industry B. Industrial C. Industrialize D. Industrialized 6. A. run B. walk C. move D. drive 7. A. largest B. biggest C. highest D. all are correct 8. A. more B. less C. few D. fewer b. Fill in the blank with one word/ phrase from the passage 1. The population in the city has increased because of ……………. 2. There have been hardly any changes in the ……………… in rural areas. 3. Steam - powered machinery helps ………………. a lot. 4. The daily schedule of people in the countryside depends on ……………. 5. Most countryside people in England work in agriculture or in ……………...
Tập hợp G các số tự nhiên z sao cho 2×z+7 lớn hơn 100
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