19．听下面一段独白，回答第17至第20四个小题．
17．Why is Lily sitting in the trolley（手推车）？
A．She is too heavy for her mother to carry．
B．Her mother wants to talk to Mrs．Bell．
C．Her mother has bought too many things．
18．What's Lily doing when Mrs．Bell and Mrs．Young are talking？
A．She hides a bottle of wine in Mrs．Young's handbag．
B．She is playing with a bottle of whisky．
C．She is playing with the things her mother has bought．
19．What can we learn from the speech？
A．Mrs．Bell steals a bottle of whisky．
B．The detective finds the whisky in Mrs．Bell's handbag．
C．Mrs．Young asks her daughter to steal a bottle of whisky．
20．What does the speech tell us？
A．Lily is a shy girl．
B．Mrs．Bell is a forgetful person．
C．People sometimes can hardly explain themselves．
