裁判员的一项重要工作是（）。A、记录犯规 B、记录比赛时间和成绩 C、记录受伤球员

Hurry up, ____ you'll be late.         

A．or

B．and

C．so

D．yet

— Have you seen Mr. Smith?    

— He arrived ______ you were asleep. [ ]

A. since

B. while

C. before

D. until

—_____ day it is!     

—Let's go out and enjoy the sunshine!    [ ]

A. What a lovely    

B. How windy      

C. What a rainy    

D. How wet

突发公共卫生事件预案启动要考虑的有哪些？

乙醇作为片剂润湿剂时常用浓度是（）

A.20%以下

B.30%～50%

C.50%～80%

D.30%～70%

E.60%～80%