题目： Submerged Plant Life:Surviving Underwater   Whereas a land plant expends a great deal of energy on the production of roots that can forage in the soil for vital water ...

题目： The Emergence of the State Before there was agriculture, people lived in small, loosely organized bands or tribes that hunted for and collected food in the wild. The emerg...

  题目： French Gothic Cathedrals Gothic-style cathedrals, known for their impressive height. pointed arches, and intricate line patterns, are among the most elaborate s...

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...

Part 1 You should spend about 20 minutes on Questions 1-14, which are based on Reading Passage 1 below. A THE AUTHENTIC TASTE OF THAILAND CHANGTOM THAI RESTAURANT AND HOTEL 12-3 6-...

Archaeological Evidence for Social Complexity   题目：     Ancient human groups that used advanced technology and divided labor into highly specialized roles are c...

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,...

The Global Industrial Revolution   题目：   In fewer than a hundred years, the global process of industrialization utterly transformed Great Britain, most of continenta...

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...

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...