四六级

　　六级考试中经常会出现有关于自然、生态、环境等的阅读内容，在六级写作中也会常常见到，那么，阅读当中的单词你认识么?你的词汇量可以支撑自己写一篇有关于自然、生态、环境的英语作文么?归根结底，还是差在词汇量上，小编为大家总结了有关自然生态这方面的词汇与佳句，考生可以背诵下来。

　　(11)Beijing now has become one of the most polluted cities in the world. Among the 10 cities with the worst air pollution in the world last year, Beijing was the third most polluted city.

　　(12)If the city had not plagued by poor quality air, the annual death rate in Beijing would have been 4 percent lower in past three years, according to the research done jointly by Beijing Medical University and Harvard University.

　　(13)Beijing consumes 2.8 million tons of coal each year, of which 75 percent are low-grade coal.

　　(14)To make room for those buildings, trees are being cut down, grass plots occupied. Cities look like nothing but grey concrete woods.

　　(15)Modern cities should be expanding with a certain percentage for green-plant areas.

　　(16)We must begin now to protect our only earth.

　　(17)Almost everything we use daily comes from the land directly or indirectly.

　　(18)But the limited land is decreasing at a surprising speed.

　　(19)The nature has given us so much, but looks at what we have done in return for its generosity.

　　(20)The ozone layer is our natural shield in the sky, but this shield is in great danger due to human activities. To protect the ozone layer is to protect us.

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