2017年学生必背高考英语3500词
现在英语复习已经进入了最后的攻坚阶段。这一阶段主要是做大量的综合题，在做题的过程中，还是要加强对单词的记忆与复习。总之，不到高考结束那一刻，就不能放松对词汇的记忆与检查。下面是小编整理的高考英语3500词以O开头的部分，希望能帮到大家!
高考英语3500词【O】
1. object n. 物品，宾语 v. 不同意 everyday objects 日常物品
her object in life=aim 目标 object to n./doing… 反对;不同意
Many local people objected to building the new airport. objective adj. 客观的
2. ◎ observe v.观察，监视，观测
observe sb do sth观察某人做某事; observe sb doing sth 观察某人在做某事
与…无关 很容易
observe sth done 观察某事被做 observed Christmas Day/one’s birthday 庆祝…
observe the law 遵守…
3. ●obtain vt/vi 获得;得到;存在 1).obtain advice/information/permission
2).These customs no longer obtain.
4. ◎ occupy v.居住;占有，占用(时，空);占领
The house is occupied. …有人住 The bathroom is occupied. …有人用
The dinner occupied 2 hours. Many anxieties occupied his mind.
忙于某事
5. ●occur vi (occurred, occurred) - happen发生
1).When exactly did the accident occur?
2). Sth occurred to/hit/struck sb. 出现在头脑中，被想到 The idea occurred to him in a dream.
3).It occurred to me that I had left my keys in the room. It didn’t occur to her to ask for help.
6. offer n./v. 主动提议 He offered 5000 dollars for the car. 出价
offer sb. sth./sth. to sb. 主动给 offer to do… 提出做
supply sb. with sth./supply sth. to sb. provide sb. with sth./provide sth. for sb.
Thanks for your kind offer of help.
7. office n. 办公室，办公楼 officer n. 警官，军官
office building/block 办公大楼 hold office 占据要职
in office/out of office 任职/离职 开始执政
8. official adj. 官方的，正式的. n. 高级官员
the official language 官方语言 an official affair 公务
9. once adv. 一次 conj. 一旦 all at once=suddenly 突然 at once 立即，同时
(just) for once/just this once 仅此一次
Once bitten, twice shy. 一朝被蛇咬，十年怕井绳。 once more=once again 再一次
once upon a time 从前，很久以前 (every) once in a while 偶尔，间或
10. one one by one 逐个的 one after another 一个接一个 one another 相互
11. oneself of oneself 自动地 for oneself 亲自 (all) by oneself 独自
talk to oneself=think aloud 自言自语 enjoy oneself 玩得开心
I am not myself today. 身体不舒服 Help yourself to some fish. 随便吃
12. only adv./adj 仅仅 I am an only child. 独生子
not only … but (also) … only to do… (意想不到的)结果...
13. ●opening a).孔，洞，缝隙 b).开放，展开 c).空缺的职位 d). 开始，开端 e).开幕式，落成典礼 1).There are several openings in the sales department .
2).The movie has an exciting opening .
3).Have you attended the opening of the Olympic Games ?
4).We could see the stars through an opening in the roof . 5).It’s nice to see the opening of a flower . Opening hours/time(营业时间) his opening remarks (他的开场白)
14. operate v. 操作，手术 operate a computer 操作电脑 operating system (计算机)操作系统 operate on a patient 给病人手术 operating table 手术台
operation n. 操作，手术 in operation 工作中 开始工作，生效
put sth. into operation/practice 实施
15. ●oppose 1).oppose sth 他反对我出国的计划。 2).oppose doing sth 我反对改变这项法律。
3).be opposed to sth/doing sth She was/remained bitterly opposed to the idea of moving abroad.
4).200 attended, as opposed to 300 the previous year .(相对于)
16. opposite adj. adv. 相反的/地，相对的/地
have the opposite opinion 持相反的观点 the opposite of heavy 反义词
There is a shop opposite our school.
17. ◎optimistic a.乐观的 take an optimistic view 抱有乐观的想法 be optimistic about…
18. or conj. 或者 or=or else=otherwise 否则 or so 大约
Hurry or else we will be late. either…or…或…或…
whether…or/or not… 无论…还是(不)… Hurry, or you will be late.(-otherwise)
19. order n. 安排，顺序 v. 命令 in/out of order 有序/有毛病
in order of time 按时间顺序 order to do/for sb. to do… 命令，指挥
order that…(should)… 命令 in order to do …/that… 为了
place an order for 订购 order a dish/a car
May I take your order? 点菜
20. organise/organize v. 组织 organisation n. 组织
a well-organised trip 有组织的，有系统的
21. other/another/the other/others/the others
other than=except (for)=besides 除了
We’re going away in June but other than that I will be here all summer.
the other day/week 前几天，前几周 another day/time 改天，下次
22. otherwise=or (else)
Do it otherwise, please. = in another way 以另一种方式
or otherwise 或其他情况 We’ll get there by train or otherwise.
23.out adv. 外 out of luck 不走运 out of sight 看不见 one out of four 四分之一 run out 用尽 outdoor activities 户外运动 eat outdoors 野餐
24. over prep. adv. take over 接管 get over 克服 (all ) over again 重新 over and again 反复地 over=more than 超过 over dinner/a coffee 在…期间
25. ◎ overcome v.战胜，克服 overcome the enemy
overcome financial problems/a bad habit
be overcome with (anger/sorrow) 极其/非常(生气/悲伤)
26. ●overlook 不注意，没注意到，俯瞰，监督指导
1).He seems to have overlooked one important fact .
2).This is a restaurant ________the lake.
3).She has been overlooked for promotion several times.
27. ●owe 1).owe sb sth =owe sth to sb 我认为你还欠我一个解释/道歉/答复。
2).他把自己的成功归功于努力的结果。_________________________________________.
3).owe it to sb that
我的成功归功于你的帮助。_______________________________________________.
4).owing to =because of
28. own adj. 自己的 v. 拥有 owner n. ownership n.
a car of my own/my own car 我自己的车
He did it on his own 独立地，单独地 I don’t own anything of any value.
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