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TF阅读真题第767篇How the First People Got to the Interior of North America
How the First People Got to the Interior of North America Most researchers believe that the first people to come to North America came from Asia to what is no...
TF阅读真题第705篇Freehold Society in Colonial New England
TF阅读真题第705篇Freehold Society in Colonial New England
TF阅读真题第820篇The Greek City-States_ Sparta and Athens
TF阅读真题第820篇The Greek City-States_ Sparta and Athens
TF阅读真题第891篇The Early Iron Age
The Early Iron Age During the Bronze Age (roughly 3300-1200 B.C.E. in the Middle East), civilizations were limited in their use of iron. Most iron occurred not in ...
TF阅读真题第928篇Creativity
Creativity A basic question about creativity is, what factors produce it? Several contrasting answers have been proposed. Cognitive psychologists, for example, have tended t...
TF阅读真题第959篇How Did Life Begin
How Did Life Begin For life to begin, it needed the right sorts of molecules, some sort of energy(such as that created by lightning), and the right environment-perhaps the 'warm l...
TF阅读真题第746篇Oceanic Bird Navigation
Migratory birds are well known to navigate over long distances between feeding grounds and breeding sites, often over thousands of miles. Ornithologist G. V. T. Matthews dem...
