Ⅰ.阅读理解

　　APlants were expected to get larger with increased carbon dioxide in atmosphere, but

　　changes in temperature, humidity and nutrient availability seem to trumped the benefits of

　　increased carbon dioxide，” said researchers from the National University of Singapore.

　　45 percent of the species studied now reach smaller adult sizes than they did in the past. The

　　researchers pointed out that warmer temperatures and changing habitats, caused by climate

　　change, are possible reasons for shrinking creatures.

　　“We do not yet know the mechanisms involved, or why some organism are getting smaller while others are unaffected，” the researchers said. “Until we understand more, we could be risking negative consequences that we can't yet quantify.”

　　The change was big in coldblooded animals. Only two decades of warmer temperatures were enough to make reptiles smaller. An increase of 1 degree centigrade caused nearly a 10 percent increase in metabolism (新陈代谢). Greater use of energy resulted in tiny tortoises and little lizards. Fish are smaller now too. Though overfishing has played a part in reducing numbers, experiments show that warmer temperatures also stop fish growth. There is a recent report on warmer temperatures' negative effects on plankton, the base of the marine ecosystem.

　　Warmblooded animals weren't immune from the size change caused by climate change. Many birds are now smaller. Mammals have been miniaturized too. Soay sheep are thinner. Red deer are weaker. And polar bears are smaller, compared with historical records.

【2017届高考英语一轮复习夯实训练：Unit 1《Lifestyles》（北师大版含解析）】相关文章：

★ 【三维设计】2017届高考英语（江苏专用）二轮复习课件：必修3 Unit 3《Back to the past》

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (41)

★ 2014届高考英语一轮复习必修4参考答案（外研版）

★ 2017高考四川省广安市英语阅读理解一轮系列训练：30（含解析）

★ （安徽专用）2014届高考英语一轮复习方案 作业手册（1）模块1 《Unit 1 Lifestyles》（含解析） 北师大版必修1

★ 【北京专用】2014届高考英语一轮复习方案课时作业：必修1 Unit 4 Earthquakes

★ （安徽专用）2014届高考英语一轮复习方案 作业手册（18）模块6 《Unit 18 Beauty》（含解析） 北师大版必修1

★ 【三维设计】2017版（江苏专用）二轮复习练习：必修3 Unit 1《The world of our senses》单元检测（含解析）

★ 安徽省淮南市2014高考英语一轮单项选择及文章训练（19）及答案

★ （安徽专用）2014届高考英语一轮复习方案 作业手册（20）模块7 《Unit 20 New Frontiers》（含解析） 北师大版必修1