Polluted air contains fine particles created by cars,factories and natural dust.Fine particles of this kind are tiny,about 2.5 micrometers in diameter,or about one-thirtieth the width of a human hair.These particles can go deep into lungs and other organs.

　　The concentration of this particulate material to which they exposed mice is equal to the concentration at which people can be exposed in some polluted urban areas.

　　After a period of 10 months,the researchers got the animals to have a series of behavioral tests.Both the behavior of mice and the results of neurological(神经的) tests done to them show that those within the polluted air had more problems in learning and memory,and higher levels of anxiety.

　　The results suggest that long-time exposure to polluted air can have measurable negative effects on the human brain and can cause a variety of mental health problems.This could have important consequences for those living and working in polluted urban areas.

　　6.The results of new research on mice first suggest that polluted air mainly does harm to 　. 

　　A.normal organs B.lungs and heart

　　C.mental health D.blood pressure

　　解析:细节理解题。根据第一段内容可知,最新研究表明,长期暴露在污染的空气中会伤害大脑,造成学习、记忆方面的问题,甚至引发焦虑,因此新研究首次提出空气污染对人们的精神健康有害。故选C项。

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