题目

Rockwatch一 The Best Club on Earth If you are a young person and interested in geology（地质学）, then Rockwatch is the club for you． When You Join New memberships receive a Rockwatch Rox file each． This has the information and top tips you will need to start enjoying geology． It' s designed to serve as your own field notebook as well． In it you will find your ·membership card  ·full colour mini-map ·thumbs up guide ·fact cards Rockwatch Magazine Our lively magazine is mailed to members three times a year． They can read reports and news from around the world, 列式计算。15除162与147的差，商是多少？