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...

Igloos   In the language spoken by the Inuit-an indigenous people inhabiting the Arctic regions of Canada, Greenland, and the United States-the word 'igloo' means 'house' or '...

Deer Antlers and Seasonal Mating 题目：   In temperate (moderate)climates and subpolar regions (those nearer to the poles), where winters are usually long and the vegetation ...

The Proto-Indo-European Language     Scholars have known for several centuries that most of the languages spoken in a broad swath from Britain to India are derived from ...

Benefits of Migration Why do animals migrate? One obvious answer is to escape cold weather by moving to a warmer region. Each fall, millions of monarch butterflies migrate southw...

Were Dinosaurs Endothermic   题目： Because dinosaurs are considered reptiles, they were for many years thought to be cold-blooded (ectothermic) like modern reptiles, requiri...

题目： Farming in Uruk   The ancient city of Uruk in the southern region of Sumer in the ancient Middle East developed an agricultural system that depended on irrigation to ...

Developing Sustainable Pesticides   题目：   Pesticides are substances used to get rid of insects or other pests. A pesticide gets a bad name if, as is usually the case,...

TF阅读真题第808篇Effects of Plate Tectonics on Species

TF阅读真题第785篇Mate Choice in Birds