克雅病与下列哪种病原体有关()
A.朊粒
B.类病毒
C.卫星病毒
D.噬菌体
E.病毒
参考答案:A
如果a>0,b<0,那么-a+b______0(选填“>”、“=”、“<”).
__________ in the traffic jam, he was likely to be late for the job interview.
A.Being stuck
B.Having stuck
C.Stuck
D.Got stuck