2017公共英语三级冲刺500核心词汇（9）
1 objection
2 observe
3 obsolete
4 obvious
5 occur
6 offer
7 oil
8 opinion
9 opportunity
10 ordinary
11 orient
12 outside
13 overcome
14 oversea
15 overwhelming
16 parent
17 part
18 particular
19 passive
20 patient
21 percent
22 perfect
23 perform
24 personality
25 perspective
26 pessimism
27 petroleum
28 phenomenon
29 plan
30 plug
31 political
32 poll
33 popular
34 population
35 portion
36 positive
37 possess
38 potential
39 precaution
40 precise
