Tiêu đề VSTEP-Reading test 14.docx ✅

Code 14 - Page 4 of With regard to environment, depending on the method of electricity generation used, greenhouse produce can create more greenhouse gases than field produce,largely due to higher energy use per kilogram. Vertical farms require much greater energy per kilogram versus regular greenhouses, mainly through increased lighting. The amount of pollution produced is dependent on how the energy is generated. Greenhouses commonly supplement CO 2  levels to 3–4 times the atmospheric rate. This increases photosynthesis rates by 50%, contributing to higher yields. Some greenhouses burn fossil fuels purely for this purpose, as other CO 2  sources, such as those from furnaces, contain pollutants such as sulphur dioxide and ethylene which significantly damage plants. This means a vertical farm requires a CO 2  source, most likely from combustion. Also, necessary ventilation may allow CO 2  to leak into the atmosphere. Greenhouse growers commonly exploit photoperiodism in plants to control whether the plants are in a vegetative or reproductive stage. As part of this control, the lights stay on past sunset and before sunrise or periodically throughout the night. Single story greenhouses have attracted criticism over light pollution. Hydroponic greenhouses regularly change the water, producing water containing fertilizers and pesticides that must be disposed of. The most common method of spreading the effluent over neighbouring farmland or wetlands would be more difficult for an urban vertical farm. 11. Where does the practice of vertical farming often take place? A. in a greenhouse B. in distant districts away from major cities. C. in piled or tilted high-rise buildings. D. in cold regions. 12. Which of the followings is a technique of vertical farming? A. Elimination of herbicides and pesticides B. Minimal use of sunlight C. Maximization of human interference D. Automatic clearance of farmland 13. In which paragraph does the author mention the higher productivityof vertical farms? A. 1 B. 2 C. 3 D. 4 14. What does the author mean by mentioning “a marketing fad” in paragraph 2? A. Vertical farming is a presently a fashion in the market. B. Vertical farm growers can no longer rely on transportation cost to advertise their products. C. The economic drawbacks of vertical farms come from the burning of fossil fuels.