题目

Public Speaking Training ·Get a coach       16      , so get help.  Since there are about a billion companies out there all ready to offer you public speaking training and courses, here are some things to look for when deciding the training that’s right for you. ·Focus on positives Any training you do to become more effective at public speaking should always focus on the positive aspects of what you already do well.  Nothing can hurt confidence more than being told that you aren’t doing well.       17      , so good public speaking training should develo下列说法错误的是（　　） A、2x2-3xy-1是二次三项式B、-x+1不是单项式C、-23πxy2的系数是-23D、-22a2b2的次数是4