A duck _____, but a dog barks. [ ]
A. meows
B. quacks
C. squeaks
B
I wondered what difficulty he had _________ the plan?
A.to carry out
B.carrying out
C.carried out
D.with carrying out
根据《刑法》规定,重大劳动安全事故罪的犯罪客体是()
A.直接负责的主管人员
B.其他直接责任人员
C.公共安全
D.劳动安全