I don't know how to begin a talk with Betty. She can sit all day long ______ a word. [ ]

A. by

B. with

C. in

D. without

绝缘桥式起重机要求在（）设置绝缘，防止电流通过吊物传送到起重机上；

A、大车轮

B、吊钩组

C、小车架

D、小车轮

E、起重机安全作业