A:agreed her to stay
B:hoped her to stay
C:approved of her staying
D:let her staying
下列实验方法不能达到实验目的是( )
故事二:美国作家卡森,曾患重病,医生预言他存活的可能性是1/500。卡森就常读幽默小说、看滑稽电影,坚持“笑疗”,结果病情不断好转,几年后竟恢复了健康。