①f(0)=0;
②若f(x)在[0,+∞)上有最小值﹣1,则f(x)在(﹣∞,0]上有最大值1;
③若f(x)在[1,+∞)上为增函数,则f(x)在(﹣∞,﹣1]上为减函数.
其中正确的个数是( )
A:0
B:1
C:2
D:3
按合理膳食的要求,每日三餐摄入各类食物的大致比例为( )
—— I'm going to Hangzhou for a holiday this weekend.—— ___ you are there, could you buy me some green tea?