Đang chuẩn bị liên kết để tải về tài liệu:
Delta's key to the next generation toefl test part 67

Tham khảo tài liệu 'delta's key to the next generation toefl test part 67', ngoại ngữ, toefl - ielts - toeic phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Audio Scripts The abiotic factor of wind increases the effects of air temperature on organisms by increasing heat loss what we call the wind chill factor. Wind also causes water loss in organisms by increasing the rate of evaporation in animals and transpiration in plants. Rocks and soil are important abiotic components of ecosystems. Their physical structure and chemical composition limit the populations of plants and also the animals that feed upon plants. Thus rocks and soil contribute to the irregular distribution of plants and animals in ecosystems. Using points and examples from the lecture explain how various abiotic factors in ecosystems affect plants and animals. FART 4-WRITING 4.1 Integrated Writing Connecting Information from Two Sources Do You Know p. 379 SPEAKING WRITING. Track 13 Now listen to part of a lecture on the same topic. One thing that really concerns water resource analysts is how much water agriculture uses. Agriculture uses a lot of water more than all other water-using sectors of society. One of our greatest concerns is the very high use of water by irrigation. This is because in most cases the water used for irrigation can t be used afterward for other purposes such as water supply for homes or industry. Some forms of irrigation use water more efficiently than others. The efficiency of water use varies by region crop agricultural practice and technology. The least efficient types of irrigation are the surface methods. Your reading really didn t go into this but think of how much water it takes for a traditional surface method like field flooding. It takes a lot of water to flood a field. The water collects into ponds or basins but then most of it either evaporates into the air or passes down through the soil into groundwater. This means that in lots of places less than half of all the water applied to a field is actually used by the crop. The rest is lost to evaporation or to groundwater. All of the flooding methods generally waste a lot