. Tại sao về mùa đông ở các sứ lạnh nước đã đóng băng trên mặt hồ mà cá vẫn sống được ở dưới?

I)Viết lại câu sao cho nghĩa không đổi,dùng từ trong ngoặc 1.Is it possible to travel to Sapa by air. (CAN) =>....... 2.Road users should obey traffic rules strictly.( OBEYED ) =>........ 3.There wasn't much traffic when I was small.(USE TO) =>....... 4.My uncle drove carelessly some year ago,but now he doesn't =>The uncle used__________________________some years ago. 5.Critics found his performance as King Lear disappointing =>Critics were_______________________as King Lear Giúp mình vs ạ,hứa vote 5*

Fill in the blanks with suitable prepositions of time 1. He was born in a small village ___ 1957 2. Tell me where you were ___ Friday,27 october 3. He used to work as a fashion designer ___ 1960 and 1970 4. ___1785___1790, the capital of the US was located in New York city 5. Author Susan Glaspell won a pulitzer prize ___ 1931 for her play Alison’s house Lưu ý: sau giới từ thường dùng V_ing hoặc N 6. He goes to his office everyday except Sunday. ____ Sunday he stays at home and works in his garden 7. I’m returning to England ____ the end of this term 8. He started going to school ____ the age of 5.so now he’s been in school ___ ten years 9. ____ first I found the work very tiring, but ___ a few weeks I got used to it 10. I’m going to Paris ___ Monday morning with Tom 11. Children get presents ____ chritmas and ___ their birthday 12. Children are very fond of swimming ____ the summer 13. My father works ____ 7am____5pm 14. _____ my birthday there will be a party ____7pm and 10 pm 15. _______years afterwards,people stil remember that terrible now 16. They arrived ___ 3 o’clock yesterday 17. I’ve been waiting for her ____half past six 18. I watched TV ____9____12 last night 19. He lived in Paris ____ three years 20. She’ll be at home ____ Friday morning 21. Our football season often begins_____ August every year 22. _____ the end of the holiday,I needed anotherholiday 23. We met ____ Easter day and went for a walk across the hills 24. The church was built ____ 1910 25. Tom and Peter came here _____ the same time

Trong thí nghiệm về sự giãn nở vì nhiệt của chất lỏng, khi nhúng bình đựng chất lỏng vào nước nóng , người ta thấy chất lỏng trong ống ban đầu tụt xuống một ít sau đó mới dâng lên cao hơn mức ban đầu. Hãy giải thích tại sao?

So sánh điểm giống nhauu và khác nhau về sự nở vì nhiệt của chất rắn và chất lỏng?

Chứng minh rằng a-b và b-a là hai số đối nhau

1, một ô tô chuyển động thẳng đều , lực kéo của động cơ ô tô là 4000N . Trong 10p xe thực hiện được một công là 32000000J a, Tính quãng đường chuyển động của xe b, Tính vận tốc chuyển động của xe

7. Holes in ozone layer can result ………………. skin cancer. A. of B. on C. in D. to 8. After the accident, many people were exposed________ radiation. A. from B. at C. to D. with 9. Thermal pollution ……………….. the temperature of a river go up. A. makes B. cause C. lead to D. result in 10. I've ………………an idea about our environmental project A. led to B. come up with C. given D. caused 11. I've ………………an idea about our environmental project A. led to B. come up with C. given D. caused 12. Water pollution________ the death of fish in the lake. A. occurs B. results of C. comes D. leads to 13. Light pollution has negative effects ________ human health. A. on B. of C. for D. to 14. Many flights were cancelled ________ the smoke from forest fires. A. so B. because C. because of D. result in 15. The river water is polluted mostly ________ the dumping of sewage. A. due to B. lead to C. because D. so 16. The air has been polluted…………………………emissions(sự phát ra) from car engines. A. since B. because C. because of D. due of 17. ……………………… can also be considered as loss of sight that cannot be corrected to a normal level with eyeglasses. A. vision loss B. hearing loss C. loss of smell D. loss of taste 18. If you experience noise pollution for a long time, you can have headaches, high blood pressure and ……………………. A. hearing loss. B. loss of vision C. loss of taste D. loss of smell 19. Polluted water also causes the death of …………………..animals such as fish, crabs, or birds. A. aquatic B. land C. amphibians D. overhead 20. ________can cause high blood pressure and hearing problems. A. Air pollution B. Light pollution C. Water pollution D. Noise pollution 21. . ________ plastic takes so long to break down, it pollutes the land and ocean. A. Because B. Due to C. Even if D. Although 22. If rubbish is non-biodegradable, it________ forever. A. exists B. will exist C. won’t exist D. doesn’t exist 23. Grace didn’t love nature, ________ she wasn’t happy when her group went camping in a jungle. A. but B. and C. because D. so 24. Thousands of fish were killed ________ a discharge (sự phóng , chảy ra)of poisonous chemicals from a nearby factory. A. because B. lead to C. result in D .because of 23. ________the fog, the flight can’t take off. A. Since B. Because C. Due to D.In spite of 25. ________the garbage dump smells terrible, no one lives around there. A. Because of B. Since C. Although D. Even though 26. Acid rain can lead……………….atmospheric pollution. A. of B. to C. in D. from 27. The levels of carbon dioxide in the atmosphere have risen________ the burning of fossil fuels. A. therefore B. because C. in spite of D. due to 28. ________the airport is near our neighborhood, we must suffer from noise pollution every day. A. Since B. Although C. Unless D. Due to 29. There would be much less pollution________ people stopped using cars completely. A. if B. since C. when D. although 30. Emissions of pollutants into the air can________ changes to the climate. A. get on B. end up C. go into D. result in

một thửa hình thang có đáy bé 26 m , đáy lớn hơn đáy bé 8m, đáy bé hơn chiều cao 6m. trung bình cứ 100 m ² thu hoạch được 70,5 kg thóc. Hỏi ruộng đó thu hoạch được bao nhiêu tạ thóc

Chiều dài của thanh đồng và sắt ở 0 độ c là 20m. Hỏi khi nhiệt độ tăng lên 40 độ c thì chiều dài của hai thanh hơn kém nhau bao nhiêu? Thanh nào dãn nở vì nhiệt nhiều hơn? biết rằng khi nhiệt độ tăng thêm 1 độ c thì chiều dài thanh sắt tăng thêm 0,000012 chiều dài ban đầu, chiều dài thanh đồng tăng thêm 0,000018 chiều dài ban đầu.