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.

　　1．What harmful effect of polluted air is mentioned in other studies?

　　A．The harmful effect on learning.

　　B．The harmful effect on all the organs.

　　C．The harmful effect on lungs and heart.

　　D．The harmful effect on improving memory.

　　2．The bad effects of tiny particles in polluted air are those EXCEPT ________．

　　A．high

　　blood pressure problems

　　B．making human hair thinner

　　C．different kinds of diseases

　　D．swelling in much of the body

　　3．From the last sentence we can infer that people living in polluted urban areas ________．

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