Unit 5知识点讲解
重点单词：
file; wild; bamboo; adult; weight; kilogram; population; behaviour; birth; shoulder; central; menu; fur; cruel; organization; danger; face; Asian; weigh
常考短语：
1. in the wild 在野生环境中 2. at birth 出生时
3. on one’s own 独自 4. close to 几乎；接近
5. become/ be good at 擅长 6. heard of 听说
7. at least 至少；起码 10. cut down 砍倒
11. give birth to 生孩子，产仔 12. learn about 知悉，了解
13. a kind of 一种 14. between…and… 在…和…之间
15. feel sorry about 为…感到遗憾 16. at least 至少
17. in memory of 纪念 18. fly away 飞离
19. fall asleep 入睡 20. The number of … ……的数目
