上气不足属于下列何种病变( )
A.气滞B.气逆C.气陷D.气闭E.气脱
参考答案:C
解析: 气陷的病理变化主要有“上气不足”和“中气下陷”两方面。
I think Tom, as the head of a big department, should either study regularly or ________ his job. [ ]
A. quits
B. to quit
C. quitting
D. quit
豌豆、小麦的传粉方式是( )
A.自花传粉
B.异花传粉
C.风力传粉
D.昆虫传粉