The little boy ____than share them with others.
俄罗斯是世界上最大的能源出口国之一,被称为( )
①若p是q的充分不必要条件,则¬p是¬q的必要不充分条件;
②命题“∃x∈R,x2+1>3x”的否定是“∀x∈R,x2+1<3x”;
③设x,y∈R.命题“若xy=0,则x2+y2=0”的否命题是真命题;
④若 z=4i1+i+(1+3i)2,则z=z→
Before entering the room,I was asked to show the soldier the________ of my suitcase.
小明今天计划要跑13公里,已经跑了5公里,还需要跑____公里。