业务体制改革的总体目标是建立多轨道、集约化、研究型和（）业务。
A.准确性
B.精细化
C.开放式
参考答案：C
已知a、b互为相反数，c、d互为倒数，试求：﹣（a+b+cd）+（a+b）2008+（﹣cd）2007的值．
About ________ of the workers in that steel factory_______ young people.
A．third-fifths ; are
B．three-fifths ; are
C．three-fives ; is
D．three-fifth ; is
