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TF阅读真题第759篇Trade and Early State Formation
Bartering was a basic trade mechanism for many thousands of years; often sporadic and usually based on notions of reciprocity, it involved the mutual exchange of commoditi...
TF阅读真题第698篇European Cities and the Rise of Commerce
TF阅读真题第698篇European Cities and the Rise of Commerce
TF阅读真题第778篇The Evolution of Reptiles and Therapsids
TF阅读真题第778篇The Evolution of Reptiles and Therapsids
TF阅读真题第886篇Opera in Seventeenth-Century Venice
Opera in Seventeenth-Century Venice Opera, a form of drama set to music and featuring vocal performance supported by an orchestra, was born in Italy at the very end ...
TF阅读真题第922篇Horns in Beetle Competition
Horns in Beetle Competition Intraspecific competition-that is, competition between members of the same species for limited resources-can be a complex phenome...
TF阅读真题第832篇Canals and Railroads in the Early 19th
TF阅读真题第832篇Canals and Railroads in the Early 19th
TF阅读真题第739篇The Formation of Moons
All planets in the solar system except Venus and Mercury have at least one moon orbiting them,with the two largest jovian (giant) planets,Jupiter and Saturn,each having over sixty....
TF阅读真题第763篇Methane Hydrate as a Potential Fuel
Methane Hydrate as a Potential Fuel At the bottom of the world's oceans lies a potential source of energy that could provide society with fuel well into the next century. Th...
