例如: W:I hope the library is open now. M:Look at the sign.It says:9 a.m.to 5 p.m.weekdays;9 a.m.to 3 p.m.Saturdays;9 a.m.to 12 noon Sundays. Q:When will the library be open on Saturdays? A.From 9 a.m.to 5 p.m.(weekdays) B.From l2 noon to 9 p.m.(×) C.From 9 a.m.to 12 noon.(Sundays) D.From 9 a.m.to 3 p.m.(Saturdays) 若能边听边对选择加以记录或标示(如