The air sac system is bigger than the lungs and takes up 15 percent of the chest and belly area.

　　Meanwhile，the bird’s great oxygen needs are also handled by the internal breathing system. The oxygen，stored primarily in body fat tissue，is burned through the process of cell respiration. This process produces both muscular energy and heat.

　　How does a bird breathe？

　　Ways to get oxygen For birds and dogs，by breathing in air For fish，from 1. ________through its body

　　Two 2. ______systems Internal and external

　　External respiration system Using the lungs and a series of air sacs To communicate with body parts 3. ________

　　4. ____sac system Bigger than the lungs

　　Taking up a 5. ______part of the chest and belly area

　　6. ______of bird breathing A stream of air

　　▲going through lungs without 7. ______

　　▲being channeled through the complex system of air sacs and through 8. ________bones

　　▲being

　　9. ______forward through the lungs again，then through more air sacs

　　▲ 10. ______in the windpipe and are expelled from the body

　　答案：1. water　2. respiration　3. directly/straight　4. Air　5. small　6. Process 7. stopping/stop 8. hollow 9. channeled　10. completing/finishing/ stopping

【【名师全程】2011届高考英语总复习 Unit1 名师点津（学案）人教版必修2】相关文章：

★ 【北京专用】2014届高考英语一轮复习方案课时作业：选修8 Unit 4 Pygmalion

★ 【外研英语，七省专用】2014《走向高考》一轮总复习（2016春出版）第二部分 学生作业手册：必修三3-4

★ （安徽专用）2014届高考英语一轮复习方案 作业手册（15）模块5 《Unit 15 Learning》（含解析） 北师大版必修1

★ 【人教版】2014届高考英语一轮复习指导考点针对练：必修5 unit1《Great scientists》

★ 四川省2016届高考英语一轮复习课时作业（45） Module 3 Foreign Food 外研版选修8

★ 【外研英语，七省专用】2014《走向高考》英语一轮总复习（2016春出版）第一部分 教师讲义手册：选修八8-6

★ 2017届高考英语二轮复习课时训练：4（含解析）

★ 【浙江专用】2014届高考英语一轮复习课时作业(十三)必修3Unit 3《The Million Pound Bank Note》

★ 【优化方案】2017届高考英语二轮复习全国卷Ⅱ题型重组训练：第16组（含解析）

★ 【优化方案】2017届高考英语二轮复习全国卷Ⅱ题型重组训练：第17组（含解析）