I think summer is hot.
A:to
B:two
C:too
— Shall we go hiking this weekend?
— Sounds ____. I think we'll have a good time.
鱼、蝾螈、龟、鸡、猪、牛、兔7种脊椎动物和人的早期胚胎都有鳃裂和尾,这说明( )。
已知函数f(x)=x2﹣2(a+m)x+a2,g(x)=﹣x2+2(a﹣m)x﹣a2+2m2,(a,m∈R),定义H1(x)=max{f(x),g(x)},H2(x)=min{f(x),g(x)}(其中max{p,q}表示p、q中较大值,min{p,q}表示p、q中的较小值)记H1(x)的最小值为A,H2(x)的最大值为B,则A﹣B=( )