5、intheracelasttime?A.30.5seconds.B.13.5seconds.C.14.5seconds.听第7段材料,回答第8至10题。( )8.Whichshirtismadeofsilk?A.TheblueoneB.Thegreenone.C.Thewhiteone.( )9.Howmuchdoesthesilkshirtcost?A.$78.B.$87.C.$80.( )10.Whydoesthemandecidetobuytheshirt?A.Itisverycheap. B