A:though sounded the pla
B:though the plan sounded
C:the plan sounded though
D:sounded the plan though
生物个体发育的起点是( )
已知命题p:∀x∈12,1,1x-a≥0;命题q:∃x∈R,x2+2ax+2-a=0,若p∧q是真命题,则实数a的取值范围为( )
生命的诞生与进化经过了极其漫长而又坎坷的历程,下列说法你认为错误的是( )