3. During World WarⅡ, Linus Pauling　.

　　A. had to stop his research because of the war

　　B. made great contributions to the safety of the country

　　C. joined the army to fight for the safety of the country

　　D. took part in researching nuclear bombs

　　【解析】选B。细节理解题。根据第三段第一句话“During World WarⅡ, Pauling was a member of the Research Board for National Security, for which he was awarded the Presidential Medal of Merit in 1948. ”可以得出正确答案为B选项。

　　4. The main idea of the passage is to show　.

　　A. Linus Pauling’s attitude towards nuclear weapons

　　B. Linus Pauling’s contributions to the world

　　C. Linus Pauling’s research on the structure of molecules

　　D. Linus Pauling’s getting the Nobel Prize for Peace

　　【解析】选B。主旨大意题。本文主要介绍了Linus Pauling一生的成就及其对世界的贡献, 所以应该选择B选项。

　　Ⅱ. 完形填空

　　This is a story that can teach us a good lesson. One day, a man in rags begged from door to door along the street. With an old wallet in his hand, he was asking for a few coins to buy something to eat. He kept complaining about his bad fortune and kept　1　why those who had so much money were never　2　and were always desiring more.

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