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TF阅读真题第807篇The Birth of the Solar System
The Birth of the Solar System The Birth of the Solar System 题目： Scientists believe that the sun and the planets in our solar system formed from a vast clo...
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The Greek City-States: Sparta and Athens Of the hundreds of city-states that evolved during the Archaic Age, (800- 479 B.C.), Sparta and Athens stand out for their vividly contras...
TF阅读真题第908篇The Search for the Origins of Writing
The Search for the Origins of Writing Who invented the first writing? Like many questions of its type in archaeology, this one is not easily answered. Some might arg...
TF阅读真题第943篇The Origin of Flight in Birds
The Origin of Flight in Birds 题目： Debate over avian origins was stimulated in 1861 when the 150-million-year-old fossil of a bird-like creature was unearthed. Called Archaeopt...
TF阅读真题第982篇Prairie Diversity
题目： Prairie Diversity 1 Prairies—the grasslands that once covered immense areas of central North America—were created and maintained by factors that favored the growth of g...
TF阅读真题第770篇Economic Reasoning
Economics begins with the assumption that human actions are rational-intended for maximum self-benefit. For example, people pay more for a larger box of the same cer...
