A:日德兰海战
B:索姆河战役
C:凡尔登战役
D:萨拉热窝事件
—_______ is your mother, Dangdang?
—She's in the kitchen.
已知函数f (x)=asinx+btanx+1,满足f (5)=7,则f (﹣5)的值为( )