The problem with animals waking up early, or skipping hibernation altogether, lies with the creatures’ metabolism(新陈代谢). When the animals hibernate, their metabolism drops significantly. The animals’ heart rate slows, and they require very little energy to live. When the animals awake from their winter slumber, their metabolism returns to normal.

　　But while their metabolism may be as active as it was before hibernation, food sources aren’t as available as they were before. A marmot may wake up when temperatures get warmer, thinking it’s spring, but plants will not have got the amount of sun they need to signal their spring period of growth. So until the plants grow, the marmots have no reliable food source.

　　Many scientists believe the problem will continue to get worse. In addition to changes in hibernation patterns, some believe that other animals will also begin to change their migration patterns or begin to give birth earlier. For many biologists, that’s a scary prospect. Terry Root, an animal expert at Stanford University, said, “I do think what we will be facing is the extinction of many species. ”

　　1. What is the viewpoint of the writer?

　　A. Global warming will continue to get worse as time goes on.

　　B. Global warming will lead to shortened hibernation of some animals.

　　C. Shortened hibernation will result in declines in the population of animals.

【2017届江苏省高考英语一轮复习：必修5 Unit 2课时提升作业(牛津译林版)】相关文章：

★ （全国通用）2014届高考英语一轮单元复习 限时强化训练四

★ 【浙江专用】2014届高考英语一轮复习课时作业(三十)选修6Unit 5《The power of nature》

★ 【北师大版】2014届高考英语一轮复习指导课时作业：Unit 7 A卷 Word版含解析

★ 2017届高考英语二轮复习大题冲关秘籍完形填空之记叙文：应试策略（含解析）

★ 2017年高考英语二轮复习精品资料：专题14 阅读理解（押题专练）（原卷版）

★ 2017届高考英语二轮复习课时训练：4（含解析）

★ 【三维设计】2017版（江苏专用）二轮复习练习：必修1 Unit 1《School life》课时跟踪检测B卷（含解析）

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (21)

★ 2014届高考英语一轮复习课时作业(十九)必修4Module 1《Life in the Future》（外研版）

★ 【人教版】2014届高考英语一轮复习指导考点针对练：必修2 unit4《Wildlife protection》