在应激过程中，消极性最小而积极性最高的是（）
A.逃避
B.挑战
C.攻击
D.依赖
参考答案：B
I was almost _______ to death at the sight of the ________ scene.
A．frightening, frightened
B．frightening, frightening
C．frightened, frightened
D．frightened, frightening
已知⊙O的半径为5，点A到圆心O的距离为3，则过点A的所有弦中，最短弦的长为______．
