試題14

　　In the following essay , each blank has four choices.Choose the most suitable one from the four choices and write down in the answer sheet.

　　To _(1)_ a TCP connection , that activating atation sends a message to another station.that station responds to the activating station that it is ready to establish a communication session.the first station then responds to confirm the connections and an _(2)_ transfer of data _(3)_ to establish data transfer controls.Connection-oriented sessions are useful for _(4)_ data exchanges or when a _(5)_ permanent connection is necessary.

　　(1): A.creat B.set up C.produce D.build

　　(2): A.initial B.empty C.useful D. active

　　(3): A.tries B.begins C.take place D.prepares

　　(4): A.short B.prolonged C. user D.control

　　(5): A.very B. prepably C. apparently D.relatively

　　Answers:BACBD