Pastoralism as a Way of Life     Pastoralism is a form of food production that involves the keeping of domesticated herd animals and influences both the social and econo...

Tyrannosaurus rex: Predator or Scavenger? Tyrannosaurus rex was among the largest of the theropods, a group of mostly carnivorous (meat-eating) dinosaurs that roamed the Earth dur...

TF阅读真题第875篇Life in the Desert   Life in the Desert     In the austere and inhospitable environment of the desert, each inhabitant must be highly specialized ...

TF阅读真题第811篇Dorset Culture

Diving for Food by Birds     Seabirds are physiologically adapted to dive underwater for food, a strategy that necessarily poses problems. An obvious problem is that whe...

Debating the Agricultural Diet     An affluent society is one in which resources are ordinarily not scarce and most society members have achieved a general level of econ...

题目：     Prosperity in British North America     The British colonies of North America developed at a remarkable pace throughout the later colonial period. ...

题目： Carbon Dioxide Levels in the Ocean The concentration of carbon dioxide gas (CO2) is rising in the atmosphere, and some of this CO2 is taken up by ocean surface waters. To ...

Classical Greek Tragedy       In 534 B.c.E. the city-state of Athens in what is today Greece added performances of tragedies to its annual festival honoring the go...

Temperate Plant Phenology   Phenology is the timing of growth and reproductive activity within a year, and it can vary greatly among plant species, populations, and even indiv...