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日本第二期科学技术基本计划到2002年取得了4人获诺贝尔奖的成效。()

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科技发展的社会问题比以往的军事技术更复杂。()

《美国清洁能源安全法案》规定,美温室气体排放量到2020年时,要在2005年的基础上减少17%,到2050年时减少80%以上。法案还要求逐步提高来自风能、太阳能等清洁能源的电力供应。此外,法案还引入温室气体排放权交易机制。()

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You should spend about 40 minutes on this task. Write about the following topic: Happiness is considered very important in life. Why is it difficult to define? What factors are important in achieving happiness? Give reasons for your answer and include any relevant examples from your own knowledge or experience. Write at least 250 words.

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