Passage 13（2020 •铁岭葫芦岛）
阅读下面短文，简略回答所提出的问题。

Cao Yuan was born in 1996. As he was a young kid, he liked to learn on his own. He was not afraid of asking difficult questions. He spent two years finishing his middle and high school classes. At the age of 14, he started taking classes at a university. Although Cao is young，he shows maturity(成熟)beyond his age.
When he was 24, he published(发表)two papers in Nature on May 6th. Nature is one of the top science magazines in the world. Many scientists dream of publishing their papers in it. But it is really hard. One has to make a very important discovery.
Cao's papers are about graphene(石墨烯)—the thinnest and strongest in the world. Scientists first discovered it in 2004.
However, Cao found that sometimes graphene can change. It can change between a superconductor(超导体)—a material that conducts electricity(导电), and an conductor(绝缘体)—a material that doesn't conduct electricity. With it, scientists can find cheaper and easier ways to use electricity.
Now Cao is a doctoral student studying at MIT. He isn't afraid of failure in his work. "He Just rolled up his sleeves(袖子)and went on working."
76. What did Cao Yuan like to do when he was a kid?
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77. Where did Cao Yuan publish two papers on May 6th?
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78. Why do many scientists dream of publishing their papers in Nature?
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79. When did scientists first discover graphene?
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80. Is Cao Yuan afraid of failure?
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这是一篇记叙文，文章主要讲述曹原发表了两篇关于石墨烯的论文在《自然》杂志上的故事。
76. He liked to learn on his own. 【解析】根据第一段“As he was a young kid, he liked to learn on his own”可知当曹原还是孩子的时候，喜欢自学。故答案为He liked to learn on his own.
77. In Nature.【解析】根据第二段“When he was 24, he published(发表)two papers in Nature on May 6th”可知是在《自然》杂志上发表了两篇论文。故答案为In Nature.
78. Because Nature is one of the top science magazines in the world. 【解析】回答why提出的疑问，用because引出原因。根据第二段“Nature is one of the top science magazines in the world. Many scientists dream of publishing their papers in it”，《自然》是世界上顶级科学杂志之一，很多科学家梦想着在上面发表论文。故答案为Because Nature is one of the top science magazines in the world.
79. In 2004.【解析】根据倒数第三段“Scientists first discovered it in 2004”可知科学家在2004年第一次发现石墨烯。故答案为In 2004.
【80题详解】
80. No, he isn’t.【解析】一般疑问句用yes或者no来回答。根据“He isn't afraid of failure in his work”可知他不害怕失败。故答案为No，he isn’t.