TF阅读真题第842篇Waking Up: Coming Out of Hibernation

Language and Migration 题目： The study of language can offer important clues about the historic migration of people around the world. Most historians would place the emergence o...

The Key Factors Influencing Soil Formation   Soil is the product of the complex interplay of several factors. Weathering, a process that breaks down rocks by physical (mechani...

American Licensing Laws 题目：   In the early-nineteenth-century United States, the medical profession was largely unregulated. There were several competing schools of medic...

TF阅读真题第850篇The Australian Megafauna Extinctions

题目： Submerged Plant Life:Surviving Underwater   Whereas a land plant expends a great deal of energy on the production of roots that can forage in the soil for vital water ...

TF阅读真题第819篇The Growth of Play in Children

TF阅读真题第820篇The Greek City-States_ Sparta and Athens

TF阅读真题第841篇The Beginnings of Radar Astronomy

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...