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MOCK TEST 1 Why does the author discuss "Vera Rubin's work on galaxy rotation curves"?

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The Mysteries of Dark Matter
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Dark matter, an elusive and invisible substance, makes up about 27 percent of the universe’ mass. Unlike ordinary matter, dark matter does not emit, absorb, or reflect light, making it undetectable by conventional telescopes. Its existence is inferred from its gravitational effects on visible matter, such as stars and galaxies.

Evidence of dark matter emerged in the 1930s when astronomer Fritz Zwicky saw that galaxies in clusters were moving faster than expected. In the 1970s, Vera Rubin's work on galaxy rotation curves provided further support. She found that stars at the edges of galaxies were rotating as fast as those near the center, which defied Newtonian physics unless an unseen mass was present.

Despite extensive research, the composition of dark matter remains a mystery. Scientists have proposed candidates like weakly interacting massive particles (WIMPs) and axions, but none have been conclusively detected. Advanced experiments and observations continue to search for dark matter particles and aim to understand their properties. If successful, discovering dark matter's true nature could revolutionize our understanding of the universe's structure and evolution. Until then, it remains an enigma that challenges scientists to push the boundaries of knowledge and technology.

3.Why does the author discuss "Vera Rubin's work on galaxy rotation curves"?

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1. 题干:Why does the author discuss "Vera Rubin's work on galaxy rotation curves"? 作者为什么讨论“维拉·鲁宾关于星系旋转曲线的工作”? 2. 分析:题目类型:修辞目的题。解题策略:分析作者引用具体研究或事例是为了支持或说明哪个更宏观的观点或论点。 3. 定位信息理解:该段首句指出:“Evidence of dark matter emerged in the 1930s when astronomer Fritz Zwicky...”。随后用“In the 1970s”引出Vera Rubin的工作,并说明其“provided further support”。信息理解:作者将Vera Rubin的工作作为继Zwicky初始证据之后,另一个重要的、支持暗物质存在的观测证据。她的研究不是挑战Zwicky,也不是主要为了解释恒星速度差异或挑战牛顿物理本身,而是用新的观测现象为同一个核心论点(暗物质存在)提供进一步的佐证。 4. 分析选项:(A) To provide further support for the initial evidence of dark matter’s existence (为暗物质存在的最初证据提供进一步的支持) - 分析:这与原文中“provided further support”的表述完全一致,准确地概括了作者引用此研究的意图。此为正确答案。 (B) To explain the differing speeds of stars within galaxies (解释星系内部恒星的不同速度) - 分析:这是鲁宾研究的现象(边缘恒星与中心恒星速度相似),但作者提到这个现象的目的不是为了解释速度差异本身,而是用这个异常现象作为证据来支持暗物质的存在。 (C) To point out a problem with Fritz Zwicky’s observations (指出弗里茨·兹威基观测中的一个问题) - 分析:原文未暗示鲁宾的工作是为了质疑兹威基。他们是不同时期、研究不同现象(星系团运动 vs. 单个星系旋转)的科学家,共同支持同一理论。 (D) To challenge the claims of Newtonian physics (挑战牛顿物理学的论断) - 分析:她的发现确实与仅考虑可见物质的牛顿力学预测不符,但这只是现象描述。作者提及牛顿物理学是为了强调观测异常,从而引出需要“看不见的质量”(即暗物质)来解释,其最终目的仍是支持暗物质的存在,而非单纯挑战现有物理理论。

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