仿写
扫扫卫生 确确实实
____作业 ____
____发现 ____
— My computer has gone wrong. It needs _______ soon.— Why not have David _______ it? Nobody can if he can't.
已知命题p:“∀x∈0,1,a≥ex”,命题q: “∃x∈R,x2+4x+a=0”,若命题p,q均是真命题,则实数a的取值范围是( )