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  3. Our universe is dotted with over 100 billion galaxies, and each one contains roughly 100 billion stars. It is unclear how many p

Our universe is dotted with over 100 billion galaxies, and each one contains roughly 100 billion stars. It is unclear how many p

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问题    Our universe is dotted with over 100 billion galaxies, and each one contains roughly 100 billion stars. It is unclear how many planets are orbiting these stars, but it is certain that at least one of them has evolved life. In particular, there is a life form that has had the capacity and courage to speculate about the origin of this vast universe.
   Humans have been staring up into space for thousands of generations, but we are privileged to be part of the first generation who can claim to have a respectable, rational and coherent description for the creation and evolution of the universe. 【F1】The Big Bang model offers an elegant explanation of the origin of everything we see in the night sky, making it one of the greatest achievements of the human intellect and spirit. It is the consequence of an endless curiosity, a fabulous imagination, acute observation and ruthless logic.
   Even more wonderful is that the Big Bang model can be understood by everyone. When I first learned about the Big Bang as a teenager, 【F2】I was astonished by its simplicity and beauty, and by the fact that it was built on principles which, to a very large extent, did not go beyond the physics I was already learning at school. 【F3】Just as Charles Darwin’s theory of natural selection is both fundamental and comprehensible to most intelligent people, the Big Bang model can be explained in terms that will make sense to non-specialists, without having to water down the key concepts within the theory.
   But before encountering the earliest stirrings of the Big Bang model, it is necessary to lay some groundwork. 【F4】The Big Bang model of the universe was developed over the last hundred years, and this was only possible because twentieth-century breakthroughs were built upon a foundation of astronomy constructed in previous centuries. In turn, these theories and observations of the sky were set within a scientific framework that had been diligently crafted over two thousand years. Going back even further, the scientific method as a path to objective truth about the material world could start to blossom only when the role of myths and legends had begun to decline. 【F5】All in all, the roots of the Big Bang model and the desire for a scientific theory of the universe can be traced right back to the decline of the ancient mythological view of the world.
【F4】
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答案大爆炸宇宙模型形成于过去的一百年间，但该模型能得以形成，就在于二十世纪的突破性成就是在上几个世纪的天文学研究成果的基础上取得的。
解析 ①本句为并列句，由两个并列的分句构成，分句2带有一个because引导的原因状语从句。②over the last hundred years充当分句1的时间状语，表示宇宙大爆炸模型发展形成所历经的时间段。③分句2的be only possible because…意思是“只有……才可能”；twentieth-century breakthroughs指包括“大爆炸宇宙模型”在内的20世纪的突破性成就；constructed in previous centuries为过去分词短语，修饰astronomy，说明这些天文学理论经过几个世纪才得以成形。
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