— These days I can only sleep for four or five hours at night as I’m too busy with my research work..

— If you keep going on like that, you are sure to ______ sooner or later.

A．get down

B．break down

C．calm down

D．put down

某分部工程中各项工作间逻辑关系见下表，相应的双代号网络计划如下图所示，图中错误的有（）。

A.多个终点节点 

B.多个起点节点 

C.工作代号重复 

D.不符合给定的逻辑关系 

E.节点编号有误