The little boy wasat the murder’sface wi
题型：选择题
问题：
The little boy was at the murder’s face with a gun in his hand.
A．frightening; frightened
B．frightened; frightening
C．frightened; frightened
D．frightening; frightening
题型：选择题
下图为反射弧结构示意图，下列说法中正确的是
A．刺激③处，该处细胞膜电位变为外正内负
B．若从③处切断神经纤维，刺激④，E不能产生反应
C．兴奋在①处神经纤维上传导速度比在②处快
D．若在④处施加一较强电刺激，图中①～⑤处能测到兴奋的只有⑤