题型：填空题 题类：真题 难易度：普通
To understand why the Earth is warming up. (one) of all, we need to understand why it is warm. Our planet (cover) with atmosphere(大气）.Sunlight passes (通过) the atmosphere and reaches the Earth. The Sun heats up the (Earth) surface. When the heat rises into the air, it is stopped by some special gases in the atmosphere like CO2, the (hot) returns to the Earth and keeps it (warm) .
Power stations and cars release (释放) so (much) greenhouse gases every day. So we can help stop global (全球的) warming by using less electric things such as (关掉) lights when we leave a room, or asking our parents to turn down the heating in our house (save) energy. We can also stop global warming by finding other (way) of transportation. For example, ride a bicycle or walk instead of going by car. Another way to help stop global warming is to plant and care for trees. Because trees take in CO2, they are our best friends when fighting against global warming.
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