— What time do you get home?
— At_______.
A:A quarter past four
B:Seventy to two
C:Wednesday
D:December 12th
当a为任意实数时,直线a-1x-y+1=0恒过定点C,则以C为圆心,半径为5的圆是( )
根据宇宙大爆炸说,宇宙演化到宇宙主体阶段时( )