阅读短文并做理解题：

　　Can countries, both rich and poor, go on growing without any problems of the world? Or most countries stop their growth? Some thinkers are trying to answer these questions. After making deep studies of the world's resource(资源), they say unlimited (无限制的) growth would be very dangerous. They want to make each country believe that it is necessary to change their ways of production and ask people to have fewer children and use less resource. This, they say, will make every country strong, give people more safety and bring happiness to everyone.

1．The word“production”here means ________ in Chinese.

[　　]

2．The word“thinker”in the third sentence means “________”.

[　　]

A．people who can't speak

B．people who teaches others

C．people who is good at thinking of problems

D．people who is good at growth

　 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?

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

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

43. A. pass　　　　　　 B. bring　　　　　　 C. drink　　　　　　 D. take

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

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

46. A. after　　　　　　 B. before　　　　　　 C. as soon as　　　　 D. since

47. A. when　　　　　 B. what　　　　　　 C. how　　　 　　　D. why

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

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

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