— _________. I can't stand all this rain.
A:I don't care
B:It's hard to say
C:So am I
D:I hope not
扬子鳄是我国珍稀的爬行动物,那么构成扬子鳄的基本结构功能单位是( )
若函数fx满足:fx-4f1x=x,则fx的最小值为( )