Look at Mary, She ____ now. [ ]
A. is dancing
B. danced
C. dance
D. dances
答案：A
The bell is ringing. Hurry up, _______ you'll be late for class! [ ]
A. and
B. but
C. while
D. or
特发性血小板减少性紫癜的主要病机在于（）
A.寒、虚、瘀
B.热、虚、瘀
C.热、湿、瘀
D.寒、滞、瘀
E.寒、滞、湿
