温馨提示： 此套题为Word版，请按住Ctrl,滑动鼠标滚轴，调节合适的观看比例，答案解析附后。关闭Word文档返回原板块。课时巩固提升Global warming happens when greenhouse gases trap heat and light from the sun in the earths atmosphere, which increases the temperature. This is like when heat is trapped in a car. On a hot day, the car gets hotter when it is out in the parking lot. This is because the heat and light from the sun can get into the car by going through the windows, but it cant get back out. This is what the greenhouse effect does to the earth. The heat and light can get through the atmosphere, but it cant get out. As a result, the temperature rises. Sometimes the temperature can change in a way that helps us. The greenhouse effect makes the earth suitable for people to live on. Without it, the earth would be freezing, or it would be burning hot. It would be freezing at night because we would not get the suns heat and light. During the day, especially during the summer, it would be burning because the sun would be up with no atmosphere to filter(过滤)it, so people, plants, and animals would be exposed to all the light and heat. Although the greenhouse effect makes the earth able to have people living on it, if there are too many gases, the earth can get unusually warmer, and many plants, animals and people will die. Plants would die because they would not be able to take the heat. This would cause us to have less food to eat, and it would also limit the food that animals have. With less food for the animals that we need to survive we would even have less food. Gradually, people, plants, and animals would all die of hunger. People are doing many things to try to stop global warming. One thing is carpooling-driving with someone to a place that you are both going to. Another thing is being more careful about leaving electrical devices turning on. Now, more people are even riding buses or bikes to lower the amount of greenhouse gases in the air. Although adults do many things to help stop global warming, kids can do just as much. 【语篇概述】本文是一篇说明文。主要介绍了全球变暖是如何发生的, 温室效应的益处及坏处, 以及为了阻止全球变暖可以做的一些事情。. Skim the passage and find the main idea quickly. 答案：The introduction to global warming and how to stop it. . Read the passage again and choose the best answers. 1. By the example given in Paragraph 1, the author wants to_. A. explain how global warming happensB. show his feeling in a car in hot summerC. tell us cars are causes of greenhouse gasesD. say that there are greenhouse gases in every car【解析】选A。推理判断题。根据第一段我们知道, 作者举小汽车例子的目的是想解释全球变暖是如何发生的。2. The underlined word “it” in Paragraph 2 refers to_. A. lightB. greenhouse effectC. temperatureD. heat【解析】选B。代词指代题。根据前一句The greenhouse effect makes the earth suitable for people to live on. 可知温室效应让地球适合人们居住。没有温室效应(greenhouse effect), 地球会变得极热或极冷。3. What is the effect of atmosphere? A. It only traps the heat of the sun. B. It does great harm to humans. C. It makes the earth neither too hot nor too cold. D. It prevents all the light from the sun shining on the earth. 【解析】选C。细节理解题。根据文章第二段可知, 大气层的作用就是让地球既不会太热也不会太冷。. Read the passage carefully and finish the following composition. Global warming happens when greenhouse gases trap heat and light from the sun in the earths atmosphere, 1. (提升温度). According to the passage, the greenhouse effect has both benefit and harm. The benefit of greenhouse effect is that 2. (使地球适合人们居住)while its harm is that if there are too many gases, 3. (地球会变得异常温暖), and many plants, animals and people will die. In order to stop our earth becoming warmer and warmer, first of all, people can be carpoolingdriving with someone to a place that you are both going to. In addition, people should 4. (打开电器要更小心). Now, more people are even 5. (骑自行车以减少空气中温室气体的含量). Lets make a great effort together to stop global warming and make Earth a better place to live on. 答案：1. which increases the temperature 2. it can make the earth suitable for people to live on 3. the earth can get unusually warmer 4. be more careful about leaving electrical devices turning on 5. riding bikes to lower the amount of greenhouse gases in the air 关闭Word文档返回原板块