选修3 UNIT 5 Learning from nature 课时作业（Word练习）-【创新方案】2024高考英语一轮复习（新教材 新高考 外研版）

1/10 多学科网书城■ 品牌书店·知名教辅·正版资源 b.zxxk.com 您身边的互联网+教辅专家 UNT5课时作业（一）-（二） 课时作业（一）主题阅读集群训练（限时40分钟 1.阅读理解 A (2023合肥模拟)Ever since humanity began to farm our own food,we've faced the unpredictable rain that is both friend and enemy.It comes and goes without much warning, and a field of leafy greens one year can dry up and blow away the next.Food security and fortunes depend on sufficient rain,and nowhere more so than in Africa,where 96%of farmland depends on rain instead of the irrigation common in more-developed places.It has consequences:South Africa's ongoing drought-the worst in three decades-will cost it at least a quarter of its corn harvest this year. Biologist Jill Farrant of the University of Cap Town in South Africa says that nature has plenty of answers for people who want to grow crops in places with unpredictable rainfall.She is hard at work finding a way to take qualities from rare wild plants that are adapted to extreme dry weather and use them in food crops.The type of farming I am aiming for is literally so that people can survive as it's going to get drier and drier,"Farrant says. Extreme conditions produce extremely tough plants and a few fierce plants are highly adaptable to the ever-changing conditions.Farrant calls one of them resurrection plants )During months without water under a harsh sun,they fade and contract until they look like a pile of dead green leaves but rainfall can revive them in the matter of hours.That is to say,when they detect and extend dry period,they produce sugars and certain stress- associated proteins and other materials in their tissues to enter a glass-like state that is "the most stable state that a plant can maintain". Last year,after Chinese team published a draft genome (of rock violet,one of the best studied resurrection plants,Farrant and colleagues published a detailed study of another candidate.One or both of these models will help researchers test their ideas-so far mostly done in the lab-on test plots. 语篇解读：本文是一篇说明文。