某一高山海拔为4000米，与山脚下的相对高度约为2500米，一般情况下山顶气温比山脚下气温（   ）

数据1，2，3，a的平均数是3，数据4，5，a，b的众数是5，则a+b=____．

I'm going to be a manager ________.

    One of the easiest ways to keep healthy is to do jogging. Jogging is the name for a very gentle(舒缓的) running—it is just a little faster than walking.

    Start slow jog 20 meters, then walk 20 meters. Little by little, if you are not feeling very tired, you may do more jogging and less walking. Finally, jog the whole way. It will be easy for you to start jogging for 15 minutes twice a week, slowly, increase(增加) this to 20~30minutes every day. The longer you join in jogging, the more you enjoy it and the healthier you will become. Some people like jogging alone, and others enjoy doing it with friends. Jogging in groups makes more people keener(热心的), because you just can not stay in bed while there is a group of friends waiting outside.

    If you want to start jogging, prepare(准备) a pair of comfortable shoes and determined mind.