—"We will have a school trip next week."

—"That sounds ________.I'm sure we will have a good time there."    [ ]

A. well      

B. badly      

C. bad      

D. good

重大事故往往具有()特点。

A.发生突然

B.预见性

C.扩散迅速

D.防范困难

E.危害范围广