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高中英语人教版选修六课件:Unit+4+Section+Ⅰ+Warming+Up+&+Reading+—+Pre-reading_图文

The greenhouse effect is the rise in temperature that the Earth experiences because certain gases in the atmosphere ?大 气;大气层? trap energy from the sun. Without these gases, heat would escape back into space and Earth's average temperature would be about 60°F colder. Because of how they warm our world, these gases are referred to as greenhouse gases. Have you ever seen a greenhouse? Most greenhouses look like a small glass house. Greenhouses are used to grow plants, especially in the winter. Greenhouses work by trapping heat from the sun. The glass panels ?面,板? of the greenhouse let in light but keep heat from escaping. This causes the greenhouse to heat up, much like the inside of a car parked in sunlight, and keeps the plants warm enough to live in the winter. The Earth's atmosphere is all around us. It is the air that we breathe. Greenhouse gases in the atmosphere behave much like the glass panes ?窗玻璃? in a greenhouse. Sunlight enters the Earth's atmosphere, passing through the blanket of greenhouse gases. As it reaches the Earth's surface, land, water, and biosphere ?生物圈? absorb the sunlight's energy. Once absorbed, this energy is sent back into the atmosphere. Some of the energy passes back into space, but much of it remains trapped in the atmosphere by the greenhouse gases, causing our world to heat up. The greenhouse effect is important. Without the greenhouse effect, the Earth would not be warm enough for humans to live. But if the greenhouse effect becomes stronger, it could make the Earth warmer than usual. Even a little extra warming may cause problems for humans, plants, and animals. Section Ⅰ Warming Up & Reading — Prereading [原文呈现] THE EARTH IS BECOMING WARMER — BUT DOES IT MATTER? During the 20th century the temperature of the earth rose about one degree Fahrenheit①. That probably does not seem much to you or me, but it is a rapid increase when compared to② other natural changes③. So how has this come about④ and does it matter? [读文清障] ①Fahrenheit/'f?r?nhaIt/adj.华 氏的n.华氏温度计 ②compared to 与……相比 ③when compared to ...是 “when+过去分词”结构, 也可看作时间状语从句的省 略,补充完整为when it is compared to ...。 ④come about 发生;造成,为 不及物动词短语。 [原文呈现] Earth Care's Armstrong ⑥ Sophie ⑤ [读文清障] ⑤Sophie/'s??fI/索菲(女名) ⑥Armstrong/'ɑ?mstr??/阿姆斯 特朗(姓) ⑦graph/ɡrɑ?f/n.图表;坐标图; 曲线图 的;任意的 ⑨phenomenon/fI'n?mIn?n; f?'nɑ?m?nɑ?n/ US explores these questions.There is no doubt that the earth is becoming warmer (see Graph⑦ 1) and that it is human ⑧random/'r?nd?m/adj.胡乱 activity that

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