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专题检测卷(二十九)
阅读填空
（建议用时：20分钟）
Directions: Read the following passage. Fill in the numbered blanks by using the information from the passage.
Write NO MORE THAN THREE WORDS for each answer.
1
(2013·郴州模拟)
Air pollution refers to the introduction of some harmful gases and particulate matter(颗粒物质)in the Earth’s atmosphere which in turn results in pollution of air that the various forms of life require for various life processes. There exist natural causes of air pollution such as volcanic eruptions, wildfires, etc. as well as human causes such as vehicle emissions, industrial smoke, etc. . Over the last few decades, the air pollution caused by humans has become a lot more serious and common than natural air pollution.
