热点56 火星及火星探测的历程-备战2021年中考英语考前时事热点话题阅读+题型专练

备战2021年中考英语考前时事热点话题阅读+题型专练 热点56 火星及火星探测的历程 一、阅读理解 1 Will humans someday live and work on Mars? Many scientists think so. In fact, they are already working on plans to turn Mars into a new earth. Humans need three basic things to live: water to drink, and food to eat. Because there are not enough of them, it isn’t possible to live on Mars right now. For one thing, there is not enough oxygen. There is also no running water —just some ice. So how can we make Mars inhabitable? The answer is a process called terraforming. Terraforming means changing the environment of a planet so that it is similar to Earth’s. On Mars, the average temperature is about -60 degrees Celsius. So one of the main goals of terraforming Mars is to warm it up. One idea for warming Mars comes from a problem here on Earth. Most scientists agree that Earth is becoming warmer because of increased levels of carbon dioxide (二氧化碳). We might create similar conditions on Mars by building factories that send out carbon dioxide, which will change the environment there. Carbon dioxide will melt the ice in Mars’ polar areas. When the ice becomes water, the water will send out the carbon dioxide that is inside the ice. In addition, rain will fall, and it may be possible to grow plants for food. The plants will add more oxygen to the air. There will be many difficulties in terraforming Mars. The project could take many centuries, and the cost will be high. We have some of the technology, such as the ability to create carbon dioxide, but not the money. However, life on Mars is a real possibility in the future. 1. Why isn't it possible to live on Mars right now? A. Because the temperature on Mars is too high. B. Because it is too far away from us to reach. C. Because people don't like living on other planets. D. Because there aren't the three basic things to live on Mars. 2. What is the third paragraph mainly about? A. Making Mars warm up by building factories. B. Why we should move to Mars. C. How to make t