2015
高考英语北师大版一轮复习习题：必修1 unit 2 （附解析答案） 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.
