同步阅读(Unit9)(英文)
摘要
你知道什么叫“温室效应”吗?它对地球又有什么样的影响呢?A greenhouse is a building m ade of glass which is used for keepingoolplants warm when the outside tem perature is low.In a sim ilar w ay thereare several gases in the atm osphere w hich trap the heat produced by thesun and preventit from escaping.These gases are known as“greenhousegases”,and the way in w hich they trap heat in the atm osphere is called“the greenhouse effect”.This is notsim ple air pollution.M ost ofthe m aingreenhouse gases existnaturally in sm all am ounts in o...
引用本文（GB/T 7714）
姜红伟. 同步阅读(Unit9)(英文)[J]. 中学英语园地：高二版, 2005.
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