如图所示，上图为原图，下图为添加“滤镜”>“扭曲”后的效果，请问用了以下哪种扭曲效果（）？
A.水波
B.海洋波纹
C.波浪
D.波纹
参考答案：D
—This returned Chinese scholar has become one of the top experts in this field.
—Yes , I know him very well. He ___________ in Africa with wild animals for eight years.
A．has worked
B．had worked
C．worked
D．has been working
( )基础是柱子基础的主要类型。
A．单独 B．单元 C．单立 D．单位
