TR共279篇 第9页
TR
排序
TF阅读真题第766篇The River Nile in Ancient Egypt
The special character of the Nile, which made it central to ancient Egyptian culture, was its annual inundation (flooding). During June the river began to rise, and a quantity of g...
TF阅读真题第788篇Canals and Railroads in the Early Nineteenth Century
TF阅读真题第788篇Canals and Railroads in the Early Nineteenth Century
TF阅读真题第895篇Parental Care by Frogs
Parental Care by Frogs Only an estimated 10 percent of anuran (frog and toad) species provide any kind of parental care. But within this 10 percent there is very great diversity ...
TF阅读真题第931篇Coal’s Rise and Fall
Coal's Rise and Fall Changes in the use of coal over time are reflected in the environment. In the eighteenth century most peppered moths had black spots on white wings, but in th...
TF阅读真题第963篇Day Length and Reproductive Timing in Animals
题目： Day Length and Reproductive Timing in Animals For many animals, producing offspring at a time of year when a maximum amount of food is available is essential. Producing yo...
TF阅读真题第747篇The European Freshwater Fish Crisis
In Europe, rapid human population growth and the rise of agriculture toward the end of the first millennium had profound effects on freshwater fish, especially migratory fish like ...
