He used to make a living playing music on festivals. Now he makes shoes his own hands. A.by;with B.on;by C.with;with D.by;by 答案:A考查介词by与with的区别,by doing sth;do sth. with sth.。 定义在R上的奇函数f(x)满足f(2-x)=f(x),当x∈[0,1]时,f(x)=x.又g(x)=cosπx2,则集合{x|f(x)=g(x)}等于( )A.{x|x=4k+12,k∈Z}B.{x|x=2k+12,k∈Z}C.{x|x=4k±12,k∈Z}D.{x|x=2k+1,k∈Z}