Understan ding a conversation-|||-Directions: Listen to a conversation and choose the best answer from the four choices-|||-provided for each question.-|||-The following questions are based on what you have just heard.-|||-A)He is not improving at all.-|||-B)He has not won any games.-|||-C)He has not played well recently.-|||-D)He is not working very hard lately.-|||-2 B) Because Jimmy is kicking others out of the team.-|||-A) Because Jimmy docsn`thave the right attirude.-|||-C) Because Jimmy doesn`t like to help other teammates.-|||-D) Because Jimmy may make the team lose the championship.-|||-A)He feels sick.-|||-B)He has hurt his leg.-|||-C)He doesn`t know he`s slow.-|||-D)He doesn`t have energy to run.-|||-A) Talk to the coach.-|||-B)Speak directly to Jimmy.-|||-C)Speak to other teammates.-|||-D)Leave a note on Jimmy`s car

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[单选题]F．or each blank，choose the best answer from the four choices and write down on the answer sheet．(66) is a protocol that a host uses to inform. a router when it joins or leaves an Internet multicast group．(67) is an error detection code that most data