白痦的出现是由于（）
A.湿郁汗出不彻
B.风热之毒阻于肺胃二经
C.风湿热邪留于肌肤
D.湿热火毒内蕴
E.营血虚而风邪中于经络
参考答案：A
看图完成答句，一空一词。
1. Where are the boys?
They are ______ the ______.
2.What are one group of the boys doing?
They are______.
3.What are the other group of boys doing?
They are ______.
4.Where are the three students standing?
They are standing ______ a big ______.
5.What are they doing?
They're ______ the basketball ______.
( )是运用系统分析的方法将工作中不合理和不经济的因素排除，寻求更经济和更容易操作的工作方法，以提高系统的效率。
A．工作描述
B．工作研究
C．工作规范
D．工作设计
