His roar was so ____ that our blood turned to ice. [ ]

A. frightening

B. frightened

C. exciting

D. excited

CT滤波函数中关于高分辨率滤波模式叙述不正确的是

A．是一种强化边缘、轮廓的函数
B．可以提高空间分辨率
C．会增加图像噪声
D．会平滑图像
E．会增强对比