6、shouldstopusingit.B.Weshouldpostfrequently.C.Weshouldlimitourtimeonline.听第9段材料,回答第13至第16四个小题。13.What’stherelationshipbetweenthetwospeakers?A.Husband and wife.B.Friends.C.Brotherandsister.14.What’swrongwithHector?A.He’sbeenworkingtoomuch.B.Heoftenfallsasleepinclass.C.Hedoesn’twanttoworkinthegroceryst