The professor thought that the idea the young engineer________was worth considering.
A:brought up
B:made up
C:set up
D:picked up
已知变量x,y满足(x﹣2y)2=(x+2y)2+10,问:x,y是否成反比例关系?如果不是,请说明理由;如果是,请求出比例系数.