A:三女一男或全是男孩
B:全是男孩或全是女孩
C:三女一男或两女两男
D:三男一女或两男两女
—It's seven o'clock. It's time to go _______.
—OK, let's go.
/i:/
设函数f(x)=1+log22-x,x<12x-1,x≥1,则f(﹣2)+f(log212)=( )