下列属于经脉的是()
A．十二经别
B．十二经筋
C．十二皮部
D．十二经脉
E．奇经八脉
参考答案：A, D, E
烛焰在凸透镜另一侧光屏上成一实像，现用不透光的黑纸将凸透镜上半部遮住，屏上的像将：[ ]
A.缺少上半部
B.缺少下半部
C.完整无变化
D.完整但变暗
Things went well for her during her early life but in her middle age her ______ seemed to change.
A．affair
B．luck
C．event
D．chance
