一个五年级的孩子说:“我听人家说,爬楼梯是最好的运动,每上一个台阶,就能多活一分钟!以前,我们家住六楼,每天上学、放学我习惯了数着楼梯上下楼。有时候,还跟爸爸比谁上得快呢!可是自从搬进高层,就用电梯了,再也没有爬过楼梯。”现在,高层住宅越来越多,无论是住在哪 A fifth grade child said: “I heard people say that climbing the stairs is the best exercise, every step on the level will be able to live for a minute! In the past, we live in the sixth floor, go to school every day, after school I used to counting Stairs up and down. Sometimes, even with his father faster than anyone else! But since moved into the high-rise, the elevator, never climbed the stairs. ”Now, more and more high-rise residential, whether it is living where