一、20个英文单词
1，college
n.大学，高等专科学校，学院，社团
I am going to this college because I want to be a teacher in the future.
2，object
n.物体，宾语，目标，对象；v.提出...作为反对的理由，反对
UFO is the short form of Unidentified Flying Object.
3，low
adj.低的，矮的，少的，低下的，不重要的，沮丧的，粗俗的；adv.低声的，谦卑的，低下的；n.低点，低水平，牛的叫声，低气压区，情绪低落的阶段；vi.(牛)哞哞叫
When temperatures are this low,it's best to just stay inside.
4，instrument
n.工具，仪器，乐器，手段
The woman sitting on the sofa had a set of special instruments in her hands.
5，familiar
adj.熟悉的，熟知的，不拘礼节的，亲密的，顺便的；n.密友，常客，高级官吏的家属
Its owner's voice is very familiar to the dog.
6，role
n.角色，作用，任务，职责，社会角色，榜样，楷模
The actress played challenging roles in many different TV series.
7，athlete
n.运动员，田径运动员，强壮的人
She was an elite athlete who ran really fast.
8，trade
v.经商，交易，互相交换；n.贸易，商业，职业，行业，职业，手艺，行当
They are trading with each other.
9，possible
adj.可能的，可能发生的；n.可能性，潜在性，可能的人物，可能有的事，最高分
The base tries to find out if it's possible there are aliens in the universe.
10，temperature
n.气温，发烧，温度，体温，气氛
The weather forecast tells us today's minimum temperature will be 35'c.
11，electronic
adj.使用电子装置的，电子学的，电子操控的，电子的，网络的
The DJ played electronic music at the party.
12，prove
v.证明，证实，展现，展示，证明，检验，鉴定，结果是，表明是
It takes one second to say "I do,"but a lifetime to prove it.
13，within
prep.在...之内；adv.在内部，在里面
There is light within the house.
14，youth
n.青年，年轻人，青年时期，青春
Youth age is the symbol of hope.
15，housework
n.家务劳动
We hired a maid to do the housework because we are all too lazy to do it ourselves.
16，organize
vt.整理，组织，安排，筹办，使系统化
He is trying to organize the papers.
17，energy
n.能量，能源，活力，精力，能
The panels use solar energy to make electricity.
18，punish
v.惩罚，处罚
He punished the player by showing the red card.
19，whether
conj.是否，会不会，不管，无论
The mother still doesn't know whether it's a boy or a girl.
20，reach
v.抵达，伸手，伸手够到，达到，发展到，与...取得联系；n.范围，领域，部门
Using the red ladder, I can reach the top.
二、数列秒杀技和易错点
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