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maicamtu825
2 năm trước
54. Giá bán hòa vốn tại các mức sản lượng khác nhau được xác định bằng công thức: a. (Định phí/Sản lượng) + biến phí đơn vị. b. Định phí đơn vị + Biến phí đơn vị. c. Hai câu trên đều đúng. d. Hai câu trên đều sai.
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Our environment is in trouble. People and industries are polluting the air, rivers, lakes and seas. There are many things you can do to help the environment. Here are a few. Firstly, the burning of petroleum is one of the biggest sources of carbon monoxide (CO) that causes global warming. CO thins the ozone layer, which protects us from the sun’s ray. So try to walk, cycle or use public transportation. Secondly, the biggest use of home energy is for heating and cooling homes. It not only consumes much energy but also costs a lot of money. So turn the heat down, especially at night. Replace ordinary light bulbs with energy-saving light bulbs, which use less energy. Finally, showers use a lot of water. Buying a special “low-flow” shower head or taking shorter showers can cut this use in half. 23. We can do nothing to help the environment. 24. Carbon monoxide comes from burning of petroleum. 25.T he more petroleum we burn the better the environment is. 26. Energy is used to heat and cool homes. 27. The passage mainly discusses: ____________ a. The source of CO b. Energy-saving bulbs c. The ozone layer d. Some ways to protect the environment 28. The word “ordinary” in line 6 is closest in meaning to the word:___________ a. normal b. Cheap c. effective d. modern Gấp lắm ạ! Giải thích rõ đúng dòng nào, sai dòng nào giúp mk nhé!!!!!!!!!!!!!! CLTHN và VOTE5*

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