mng giúp e bài đọc với ạ. mng viết dẫn chứng nha. e cảm ơn nhiều The Earth has got warmer since the 1990s. This will have serious effect on agriculture. In warmer areas, it will be too dry. The amount of water could decrease by fifty percent. This could cause a large decrease in agricultural production. World temperatures could increase two degrees Celsius by the year 2040. This could cause the ice sheets to melt and raise the level of the oceans by one to two meters. Many coastal cities would be under water. Why is this happening? There is too much carbon dioxide (CO2) in the air. When oil, gas and coal burn, they create large amounts of carbon dioxide. This carbon dioxide lets sunlight enter the Earth's atmosphere and heat the Earth. However, it does not let as much heat leave the atmosphere and enter space. It is like a blanket. The heat can pass through the blanket to warm the Earth. The heat stays there and cannot get through the blanket again. Scientists call it the Greenhouse Effect. A greenhouse is a building for growing plants. It is made of glass and clear plastic. These scientists say that we must start planning now. We need to do research so that we can predict what will happen. We must conserve coal, oil, and gas. However, other scientists disagree. They say there is no reason to worry because we have at least twenty years to plan and the Greenhouse Effect will not be very serious. They believe that there is no way for the world to slow it down or stop it. We must just prepare for a high-temperature world. Meanwhile, all scientists agree that we must continue measuring the amount of carbon dioxide in the atmosphere and observing its effects. 17.What is the topic of the paragraph? A. The Greenhouse Effect B. Carbon dioxide C. The atmosphere D. The temperature 18.How has the Earth's climate been since 1900s? A. The Earth has been colder. B. Drought has happened all over the world. C. The Earth has been warmer. D. It is as cool as it used to be. 19.Which sentence is not true? A. A greenhouse is made of glass and clear plastic. B. Carbon dioxide lets sunlight enter the Earth's atmosphere but does not let as much heat leave the atmosphere and enter space. C. All scientists agree that the Greenhouse Effect is very serious. D. Coal, oil, and gas must be conserved. 20.What is the common idea of all scientists? A. We must start planning now. B. They keep on measuring the amount of carbon dioxide in the atmosphere and observing its effects. C. The Greenhouse Effect is not very serious. D. The Greenhouse Effect is very serious. 21. The word "it" in paragraph 4 refers to _________. A. scientists B. Greenhouse C. reason D. a high-temperature world