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Passage 1Nuclear power is obtained from the energy which can be released from nucleus of an atom. Until the twentieth century man used water, wood and the fossil fuels (coal, oil and gas) as sources of power. During the first quarter of the twentieth century physicists investigated the structure of the atom. In 1919 Rutherford split the atom artificially. Thirteen years later, the neutron was discovered. In 1939 Hahn and Strassman investigated the action of neutrons on uranium-235. They found that it was split into two equal pieces. This process is known as fission. It releases great amount of energy. The neutrons that are released in fission produce fissions in other atoms. This is known as a chain reaction. On 2nd December 1942 Enrico Fermi and his colleagues produced the first controlled nuclear chain reaction. Since then atomic energy has been used in war and peace. In 1951 electricity was first produced by using the heat from a nuclear reactor. More and more countries are building nuclear power stations to produce electricity. Since () atomic energy has been used in war and peace around the world.
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阅读下面的材料，以“成熟的标志”为话题写一篇800字以上的文章，题目自拟，除诗歌外，文体不限。人成熟的标志是什么？同学们常在一起讨论这个问题，有的说成熟的标志是能用理智战胜感情，有的说遇事有主见，有的说能从别人的角度来看待自我，有的说善于给予爱，有的说善于否定自我……
Passage 1Nuclear power is obtained from the energy which can be released from nucleus of an atom. Until the twentieth century man used water, wood and the fossil fuels (coal, oil and gas) as sources of power. During the first quarter of the twentieth century physicists investigated the structure of the atom. In 1919 Rutherford split the atom artificially. Thirteen years later, the neutron was discovered. In 1939 Hahn and Strassman investigated the action of neutrons on uranium-235. They found that it was split into two equal pieces. This process is known as fission. It releases great amount of energy. The neutrons that are released in fission produce fissions in other atoms. This is known as a chain reaction. On 2nd December 1942 Enrico Fermi and his colleagues produced the first controlled nuclear chain reaction. Since then atomic energy has been used in war and peace. In 1951 electricity was first produced by using the heat from a nuclear reactor. More and more countries are building nuclear power stations to produce electricity. Who produced the first controlled nuclear chain reaction?()
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