Unit 7知识点
Section A
1.It’s +数字+ 单位 + 形容词(long长, wide宽, high, tall, deep深). 
The river is 3 meters deep(深).
单位： meter(米);  kilometer千米;    square meter平方米;  square kilometer平方千米
2.提问 How high… ?  How long…?  How deep…?   
3. by doing  (do)…  通过…
4. (1)population人口数量  用big/large, small 修饰
(2)提问  What’s the population of China?
(3)The population of China is (be)about 1.4 billion. 
(4)70% of the population in the city are (be)old people.
5.feel free to do (do)… 随便… 
6. amazing 令人惊讶的（修饰物） amazed修饰人 be amazed at    be amazed to do (do)… 
7. ancient (古代的) emperors  an ancient (古老的) city
8. be to do  (do)… 表目的  The main reason was to protect  (protect)…
9. as far as I know 据我所知 
10. man-made (人造的) objects(物品)
11. protect保护    protect sb. from sth./doing  (do) 
12. run along 延伸
13. east, west, south, north东西南北    in the east of China  在中国东部
southeast 东南  southwest 西南  northeast 东北  northwest 西北
eastern 东部的; western;  southern;  northern
in the eastern part of China 在中国东部 
15. It’s dangerous to climb  (climb). 
16. thick clouds  厚的、浓的weigh的名词
24. challenge (挑战)  (1)名词（可数） a challenge to do (do)…  a challenge of doing  (do)…
a challenge to sb..    (2) 动词 challenge sb.  ;    challenge to do …
25. give up doing  (do)… 放弃 
26. achieve our dreams  实现梦想 dreams come true 梦想实现
27. achieve --- achievement成就;名词) 
28. the force of nature自然的力量
29. even though/if尽管（转折）
30. the Pacific Ocean 太平洋
Section B
1. weigh 动词，重量是….  weight名词，重量.
2. 倍数（twice 两倍； three times三倍）
(1) A + be/动词 + 倍数+ as 原级 as B.  (2) A + be/动词 …倍数 + 比较级 than B.
3. at birth 出生时;    be born 出生…; 
4.a baby panda ;      an adult (成年的)panda 
5. live to be… 活到…
6. research调查,研究;    research center研究中心
do research on sth… 做…调查   
7. prepare … for…  为…做准备
8. awake 醒着的--- asleep 睡着的 
9.  He told me the news with excitement (名词，激动)
10. fall over绊倒   
11. be special to sb…   have special meaning to…
12. a symbol of China 中国的一个象征 
13. There be sb. doing  (do)… 有某人在做…
15. every two years  每两年 
16. die from 死于 illness (疾病)
17. can’t find enough to eat (eat)..  18. endangered (濒危的) wild (野生的) animals
19. send people to school (派某人去某地) to tell (tell) (目的)…
20. the importance (重要性)of saving  (save)… 
21. Chinese government 中国政府
22. try hard to help (help)  to save (save)… 
23. Scientists are doing research (做研究) to understand  (understand)…
24. Rules on whale protection  (名词，保护).
25. Stop putting  (put) rubbish into the sea.