题目

听下面一段较长对话，回答以下小题。【1】What is Jack?A.A singer. B.An actor. C.A director.【2】What was Jack’s “big break”?A.High Seas. B.Twelfth Night. C.New York Summertime.【3】What caused the accident to take place?A.Drink-driving. B.Engine problems. C.Working overtime.【4】What can we learn from the conversation?A.Jack’s family gives him a lot of support.B.Jack won an award with the role in High Seas.C.Jack didn’t care about the negative news after the accident.将一重为80N的物体，放入一盛满水的溢水杯中，从杯中溢出了30N的水，则物体受到的浮力是（　　）A. 80N B. 30N C. 50N D. 110N