第一部分 阅读理解题（共两节，满分60分）
第一节（共15小题，每小题3分，满分45分）
阅读下列短文，从每题所给的四个选项（A、B、C、和D）中，选出最佳选项。
( A )
How much physical activity do you get？As a teenager，physical activity is important，not just for your future health but for looking and feeling your best now.How active you are early in life may affect how ableminded you are late in life.That was the finding of a new study of cognitive impairment (认知障碍)，or a loss in mental abilities.
