I heard a story about a famous scientist who had made several very important achievements.
What made him   41   from others?
He said it all came from   42   that happened when he was two years old. He tried to  43 
a bottle of milk away from the fridge, but the slippery(光滑的) bottle fell, spilling its milk all over the   44   floor.
When his mother came in,  45   shouting at him, she said, “Robert, what a great mess(一团糟) you have made! I have never seen such a big puddle(水坑) of milk. Would you like to get down and play in the milk for a few minutes   46   we clean it up?”
Indeed, he did. After a few minutes, his mother said, “Robert, when you make a mess like this, you have to clean it up at last. So,   47   would you like to do that? We would use a towel or a mop. Which do you prefer?” He chose the towel and together they cleaned up the milk.
His mother then said, “We had a failed   48  in how to carry a big milk bottle with two small hands in the kitchen. Let’s go out and fill the bottle with water and see if you can   49  a way to carry it without dropping it.” The little boy learned that if he held the bottle at the top near the lip(杯口) with both hands, he could carry it without dropping it.
This scientist then said that it was at that moment that he knew he didn’t need to be afraid to
  50  .So, what have you learnt from the story?

A．serious B．similar C．different D．important

A．an experience B．advice C．a promise D．an idea

A．pass B．bring C．drink D．take

A．kitchen B．bedroom C．bathroom D．living room

A．from B．with C．because of D．instead of

A．after B．before C．as soon as D．since

A．when B．what C．how D．why

A．experiment B．condition C．survey D．research

A．look B．discover C．recognize D．develop

A．clean the floor B．spill milk C．make mistakes D．realize mistakes