Researchers said the results indicate that time spent walking in parks 7.__________ woodlands away from the modern technology helps people to restore brain power. They say a hike provides 8.__________ easy way to lift your creative abilities after long periods in front of a computer or TV screen.

　　Ⅲ.阅读理解

　　A man wears a mask as he walks to cross a street shrouded by haze in Beijing, China, Tuesday, Jan. 10, 2017. (AP Photo/Andy Wong)

　　A new study links heavy air pollution from coal burning to shorter lives in northern China. Researchers estimate that the half­billion people alive there in the 1990s will live an average of 5.5 years less than the southerners because they breathed dirtier air.

　　For decades, a government policy provided free coal for heating, but only in the colder north. Researchers found significant differences in both particle(颗粒)pollution of the air and life expectancy in the two regions.

　　“While previous studies have found that pollution affects human health, the deeper and more important question is the impact on life expectancy，” said one of the authors, Michael Greenstone, a professor of environmental economics at Massachusetts Institute of Technology.

　　“This study provides a unique setting to answer the life expectancy question because the free heating policy greatly changes pollution concentrations (浓度)for people who appear to be of otherwise the same health，” Greenstone said.

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