Unit 2　Heroes

　　Ⅰ.阅读理解

　　A

　　LOS ANGELES—Old people who keep walking a relatively long distance may be less likely to suffer from cognitive(认知的) decline，a new study suggests.

　　“By walking regularly，and maintaining a little bit of moderate physical activity，you can reduce your likelihood of developing Alzheimer's disease and spare brain tissue，” Kirk I．Erickson，the study's lead author，said.

　　Erickson and his colleagues from the University of Pittsburgh began to establish a link between walking and memory in 1989.

　　According to the report on their study published online Wednesday in Neurology，an official journal of the American Academy of Neurology，researchers tracked the physical activity and cognitive patterns of nearly 300 adults.

　　At the very beginning，all participants，on average 78 years old and about two－thirds being women，were in good cognitive health.The researchers charted how many blocks each person walked in one week.

　　Nine years later，the participants were given a MRI scan to measure their brain size.All of them were deemed to be“cognitively normal.”

　　But after four more years，test showed a little more than one third of the participants had developed a mild cognitive impairment or dementia.

　　By correlating cognitive health，brain scans and walking patterns，the research team found that being more physically active appeared to lower the risk of developing cognitive impairment.

【【北师大版】2016届高三英语一轮复习题库 必修1 Unit 2《Heroes》】相关文章：

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (79)

★ 【三维设计】2017版（江苏专用）二轮复习练习：选修8 Unit 2《The universal language》课时跟踪检测B卷（含解析）

★ 【人教版】2014届高考英语一轮复习指导考点针对练：必修1 unit3《Travel journal》

★ 【北京专用】2014届高考英语一轮复习方案课时作业：必修5 Unit 5 First aid

★ 2014年牛津译林版高中英语总复习（第1轮）同步练习 M4《Unit 3　Tomorrow s world》

★ 【浙江专用】2014届高考英语一轮复习课时作业(三十六)选修8Unit 1《A land of diversity》

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (80)

★ 【人教版】2014届高考英语一轮复习指导考点针对练：必修3 unit4《Astronomy》

★ 【优化方案】2017届高考英语二轮复习全国卷Ⅱ规范练：7（含解析）

★ 2014届高考英语一轮复习课时作业(十九)必修4Module 1《Life in the Future》（外研版）