In Hudson Bay, the ice breaks up three weeks earlier in the spring now than it did 20 years ago. Polar bears on Hudson Bay fast（绝食） during the summer, waiting for ice to form in the fall to hunt. Every year, the summer gets longer, and the bears get skinnier. Over the past 25 years, the average weight of the female bears has dropped 68 kg. This loss affects their ability to reproduce, and already the number of births has dropped 15 percent. Unless the bears can learn to survive these climate changes, these giants of the ice may one day disappear.

　　48. What is Arctic ice doing earlier each year?

　　A. It’s freezing.

　　B. It’s hardening.

　　C. It’s melting.

　　D. It’s expanding.

　　49. What is true of polar bears that are spending more time on land in Alaska?

　　A. Their young are dying.

　　B. Their diet is changing.

　　C. Their health is improving.

　　D. Their families are growing.

　　50. What do polar bears in Hudson Bay do during the summer?[

　　A. They claim territory(地域).

　　B. They protect mates.

　　C. They hunt animals.

　　D. They stop feeding

　　51. In which publication would you most likely find this passage?

　　A. Medical News

　　B. Society Today

【2017届高考英语总复习闯关密训卷专题Unit5《Music》必修2】相关文章：

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (13)

★ 2014年牛津译林版高中英语总复习（第1轮）同步练习 M4《Unit 3　Tomorrow s world》

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (36)

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

★ 【人教版】2014届高考英语一轮复习指导考点针对练：选修7 unit4《Sharing》

★ 【人教版】2014届高考英语一轮复习指导考点针对练：必修3 unit4《Astronomy》

★ 【北京专用】2014届高考英语一轮复习方案课时作业：必修3 Unit 2 Healthy eating

★ 备战2016年高考英语复习要注意培养语感

★ 【人教版】2014届高考英语一轮复习指导考点针对练：必修4 unit5《Theme parks》

★ 四川省2016届高考英语一轮复习课时作业（40） Module 4 Music Born in America 外研版选修8