Stephen Glenn is a famous scientist who has made several medical breakthroughs．When  31  why he was so much more   32   than the average person, he replied that it all came from an experience   33   his mom…At 2, he was trying to   34   a bottle of milk from the refrigerator when he   35   his hold on the slippery bottle and it fell, spilling （洒） its contents all over the kitchen floor! When his mom came in, instead of shouting at him or __36   him a lesson, she said, “Robert, what a great mess you’ve made! I’ve   37   seen such a sea of milk．Well, now that the   38   has been done, would you please get down and   39   in the milk for a while   40   we clean it up?”So happily he did．After that, his mom said, “Robert, whenever you make such a mess like this, you’ll have to clean it up and restore everything to its proper   41  ．So which do you prefer, a sponge, towel or mop?” He   42   the sponge and together they cleaned up the milk．His mom then said, “Robert, you’ve just had a   43  experiment about how to carry a big milk bottle __44  with two tiny hands．Now go to the sink to fill the bottle with   45   and see if you can discover a way to carry it safely．” Instantly Robert learned that he could   46   it if he grasped the bottle at the  47_  near the lip with both hands．

48  wonderful a lesson! The famous scientist then remarked it was then and there that he came to know that   49_   were just opportunities for learning something new, which is what scientific experiments are all about．

       Wouldn’t it be great if all parents could  50_  the way Robert’s mom did to him?

31．A．puzzled                  B．explained                 C．asked                     D．wondered

32．A．creative                  B．diligent                    C．cautious                 D．aggressive

33．A．beyond                   B．with                       C．about                     D．from

34．A．deliver                    B．remove                   C．ring                        D．make

35．A．dismissed                B．tightened                 C．caught                   D．lost

36．A．teaching                  B．punishing                C．directing                 D．taking

37．A．sometimes              B．always                    C．rarely                     D．mostly

38．A．experiment              B．damage                   C．work                      D．favor

39．A．drink                      B．gather                     C．swim                     D．play

40．A．after                       B．when                      C．before                   D．once

41．A．situation                  B．model                     C．order                      D．size

42．A．chose                     B．used                       C．liked                       D．saw

43．A．useless                   B．funny                     C．valid                       D．failed

44．A．effectively            B．heavily                    C．strongly                  D．luckily

45．A．milk                       B．water                      C．sand                       D．stones

46．A．complete                 B．try                          C．make                      D．get

47．A．bottom                   B．cover                      C．outside                   D．top

48．A．How                       B．Too                        C．Very                       D．What

49．A．tests                       B．mistakes                 C．exercises                D．achievements

50．A．react                      B．keep                       C．show                   D．look