一、20个英文单词
1，theater
n.戏院，电影院，剧场，戏剧，戏剧事业，阶梯教室，战区，战场
The theater quickly emptied when the performance ended.
2，instead
adv.代替，顶替，反而
Have some healthy food instead of hamburgers.
3，choice
n.选择，选项，精华；adj.(尤指食物)精选的，上等的
To make the right choice,you have to attend the lessons.
4，biology
n.生物学，生理习性
Biology is the study of life and living things.
5，percent
n.百分比；adv.每一百中地；adj.每一百中的
The green part takes up 70 percent of the pie chart.
6，wealth
n.财富，财产，大量
He is a man of great wealth.
7，citizen
n.公民，市民，居民
I have become a Chinese citizen who has the right to vote after turning eighteen.
8，final
adj.最后的，决定性的，最终的；n.决赛，期末考试，当日报纸的末版
The competition is in its final stage.
9，doubt
v.怀疑，不确定；n.怀疑，疑虑
I really doubt whether aliens exist.
10，rocket
n.火箭，火箭弹，芝麻菜；vt.用火箭运载；vi.飞快地移动，猛涨
The red rocket is flying over the clouds.
11，weekday
n.工作日，平日
During weekdays,my work never stops.
12，gymnasium
n.体育馆，健身房
The most popular facility in that gymnasium is the treadmill.
13，positive
adj.积极的，乐观的，正面的，确信的，阳性的，正的，肯定的；n.正数，正极，正片，优势，优点
He faces every situation with a positive attitude.
14，period
n.时期，句号，例假，课时，节
He became a math teacher over a period of four years.
15，socialism
n.社会主义
The hammer and sickle represents socialism.Workers,unite!
16，disappoint
v.使失望，使受挫折
The exam result disappointed him.
17，alive
adj.活着的，活跃的，有生气的，存在的，意识到的，热闹的，充满的，丰富的
His beating heart shows that he is alive.
18，active
adj.积极的，主动的，活跃的，好动的，起作用的，有效的，现役的；n.积极分子，主动语态
Students are very active in class today.
19，awful
adj.糟糕的，讨厌的，可怕的，极坏的，生病的，不舒服的，极大的；adv.极其，非常
There was an awful smell coming from the dustbin.
20，central
adj.中心的，主要的，折中的，基本的；n.电话交流中央
They stand at the central point of the circle.
二、排列组合大纲考点
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