题目

（2011•南京）下列运算正确的是（ ）A、a2+a3=a5          B、a2•a3=a6C、a3+a2=a           D、（a2）3=a6  答案：D解析:A、a2与a3不是同类项，不能合并，故本选项错误；B、a2•a3=a2+3=a5≠a6，故本选项错误；C、a3与a2不是同类项，不能合并，故本选项错误；D、（a2）3=a2×3=a6，故本选项正确．故选D．  水上公园为青少年提供有趣的假日工作机会，如果你对此感兴趣并希望在假期丰富自己的生活，请仔细阅读并完成下面的招聘广告，每空一词。 INTERESTING VACATION JOBS FOR TEENAGERS --- Help out at Children's Water Park Are you  1  at water sports? Do you like kid? Can you speak English? We need young people   2   can talk to the visitors at the Park and show them around. We also look for people who can   3   kids to swim and play water games   4   them. There are also some animals in the Water Park that need care and attention. Do you like to have this   5  job? If you do, please write and tell us about your experiences. You may call Ms. Smith at 720-8491.