O

Question 1

o

Answer 1

o【前缀】对； 向； 相反； 反对oval(a.卵形的 )

Question 2

ob

Answer 2

ob【前缀】对； 向； 相反； 反对obvious(a.明显的，显而易见的)词根释义：toward, against, in the way例词：oppose,occur,offer,obtain

Question 3

oc

Answer 3

oc【前缀】对； 向； 相反； 反对occurrence(n.事故)词根释义：toward, against, in the way例词：oppose,occur,offer,obtain

Question 4

ock

Answer 4

ock【后缀】表小称或“缩小”hillock（n. 小丘；小山似的一堆)

Question 5

oct

Answer 5

oct【前缀】八octagon(n. 八边形，八角形)词根释义：eight例词：octopus,octagon,octogenarian,octave

Question 6

octa

Answer 6

octa【前缀】八octagon(n. 八边形，八角形)

Question 7

octo

Answer 7

octo【前缀】八分octopus(n. 章鱼,八爪鱼)

Question 8

ocul

Answer 8

ocul【词根】眼睛ocular(adj. 眼睛的；视觉的；目击的)

Question 9

od

Answer 9

odn.自然力【词根】歌曲;路melody(n. 旋律；歌曲；美妙的音乐)

Question 10

ode

Answer 10

ode/ EJd/n.颂诗,赋【词根】歌曲；诗歌episode(n. 插曲；一段情节；插话)

Question 11

odor

Answer 11

odor/ 5EudE/ n.气味【词根】气味；闻odor(n.气味，香气；味道)

Question 12

of

Answer 12

of/ Rv, Ev/ prep…….的【前缀】向offspring(n.儿女，子孙，后代)词根释义：toward, against, in the way例词：oppose,occur,offer,obtain

Question 13

oid

Answer 13

oid【后缀】表示“像…的”，“似…的”negroid(nadj. 黑人的；黑人似的；黑人特性的)

Question 14

ol

Answer 14

ol【词根】滋养；气味，闻petrol(n.(英)汽油)

Question 15

oleum

Answer 15

oleum/ ‘EuliEm/ n. 发烟硫酸【词根】油petroleum(n.石油)

Question 16

oligo

Answer 16

oligo词根：很少oligotrophic(adj. （湖泊、池塘等）贫营养的，营养不足的)词根释义：few, little例词：Oligocene,oligosaccharide,oligotrophic,oligarchy

Question 17

ology

Answer 17

ology词根：学科zoology(n. 动物学；动物区系)词根释义：word, study, say, speech, reason, study例词：catalog,prologue,dialogue,zoology,logo

Question 18

oma

Answer 18

oma后缀:表示“瘤”fibroma(n. [肿瘤] 纤维瘤)

Question 19

omin

Answer 19

omin【词根】预兆ominous(adj. 预兆的；不吉利的)

Question 20

omni

Answer 20

omni【前缀】全部omnipotent(adj. 无所不能的；全能的（omni全部+potent有力的）)词根释义：all, every例词：omnipotent,omniscient,omnipresent,omnivorous

Question 21

on

Answer 21

on/ Rn/ 在…上面【后缀】表示人、物；构成物理学名词southron(n. 英格兰人；南部人)

Question 22

one

Answer 22

onen. 一; 一个人【后缀】表示“酮”butanone(n. [有化] 丁酮)

Question 23

onym

Answer 23

onym【医】 术语【词根】名字synonym（n. 同义词；同义字）词根释义：name例词：anonymous,pseudonym,antonym,synonym

Question 24

oon

Answer 24

oon后缀：表名词，“人或物”buffoon(n. 小丑)

Question 25

op

Answer 25

opn.工作，操作【前缀】向oppress(vt.压迫，压制；压抑)词根释义：toward, against, in the way例词：oppose,occur,offer,obtain

Question 26

oper

Answer 26

oper【词根】工作；做operator(n.操作人员，接线员)词根释义：work例词：operate,cooperate,opus

Question 27

ophthalm

Answer 27

ophthalm前缀：眼 ophthalmia(n. [眼科] 眼炎)

Question 28

opin

Answer 28

opin【词根】看opinion（n. 意见；主张)

Question 29

opt

Answer 29

opt/ Rpt/ v.选择【词根】选择；希望；眼睛；视力optional(a.可以任意选择的)

Question 30

optim

Answer 30

optim词根：表示“最好”optimum(adj. 最适宜的)

Question 31

opto

Answer 31

opto【词根】眼睛；视力optometer(n. 视力检定装置；视力计（opto+meter测量[计]）)

Question 32

or

Answer 32

or/ R:, E/ conj.或者，还是【后缀】表示抽象名词collector(n. 收藏家；集电极；收税员)后缀释义：Noun: condition or activity例词：valor,honor,humor,minor\n#后缀释义：Verb: action例词：ponder,dishonor,clamor\n#后缀释义：Noun: person or thing that does something例词：flyer,reporter,player,member,fryer,collector,concentrator

Question 33

ora

Answer 33

ora【医】 缘, 口【词根】说；祷告oratory(n. 讲演术;小礼拜堂; 祈祷室)

Question 34

orat

Answer 34

orat词根：表示“嘴，说””oratory(n. 讲演术;小礼拜堂; 祈祷室)

Question 35

orbit

Answer 35

orbitn. 轨道, 眼眶【词根】圆 orbital(adj. 轨道的；眼窝的)

Question 36

ord

Answer 36

ord【词根】秩序,拼凑，适合，连接，接合order(n.次序；整齐)

Question 37

order

Answer 37

order/ 5R:dE/ 点菜【词根】秩序order(n.次序；整齐)

Question 38

ordin

Answer 38

ordin【词根】秩序subordinate(a.下级的，辅助的)

Question 39

org

Answer 39

org词根：做，工作，功,工具organ(n. 器官；机构；风琴；管风琴)

Question 40

organ

Answer 40

organn. 器官；机构；风琴【词根】身体organize(vt. 组织；使有系统化；给予生机)

Question 41

ori

Answer 41

ori【词根】太阳升起；上升；开始；起源originate(vi.发源 )

Question 42

orig

Answer 42

orig词根：表示“升起，开始””origin(n. 起源; 起因; 由来; 出身)

Question 43

orn

Answer 43

orn【词根】装饰；使配备家具ornament(n.装饰物 )

Question 44

orna

Answer 44

orna【词根】装饰；使配备家具ornament(n.装饰物；装饰)

Question 45

orph

Answer 45

orph词根：出去orphan(n.孤儿(orph=出去+an 离开家庭的))

Question 46

ort

Answer 46

ort【词根】升起abortion(n. 小产, 流产)

Question 47

ortho

Answer 47

ortho【词根】直的；正确的；正orthodox(adj. 正统的；传统的；惯常的（ortho正+dox→正的观点→正统思想）词根释义：straight, correct例词：orthodox,orthodontist,orthopedic,unorthodox

Question 48

ory

Answer 48

ory【后缀】表性质、大小状况、状貌victory(n.胜利，战胜)后缀释义：Noun: place for, serves for例词：territory,rectory

Question 49

ose

Answer 49

ose后缀：表形容词，“多…的”verbose(adj. 详细的, 冗长的)后缀释义：Adjective: having the quality of, relating to例词：adventurous,courageous,verbose,fractious

Question 50

osis

Answer 50

osis【后缀】构成名词hypnosis(n. 催眠；催眠状态（hypno+sis表示病状）)

Question 51

osity

Answer 51

osity后缀：表名词，ose+ity组成，表示“多…的状态”curiosity(n.好奇，好奇心；珍品)

Question 52

oss

Answer 52

oss【词根】骨头fossil(n. 化石；僵化的事物；顽固不化的人)

Question 53

ost

Answer 53

ost词根：骨osteopath(n. 整骨疗法家)

Question 54

oste

Answer 54

oste前缀：骨 osteitis(n. [外科] 骨炎)

Question 55

osteo

Answer 55

osteo【词根】骨头osteoblast(n.造骨细胞)

Question 56

ot

Answer 56

ot词根：表示“耳朵”otitis(n.耳炎（ot+it is炎病）)

Question 57

our

Answer 57

our/ 5auE/ 我们的【后缀】表示抽象名词vigour(n.活力，精力；元气)

Question 58

ous

Answer 58

ous【后缀】表性质、大小状况、状貌continuous(a.连续不断的，持续的)后缀释义：Adjective: having the quality of, relating to例词：adventurous,courageous,verbose,fractious

Question 59

ously

Answer 59

ously后缀:副词，具有…性质的等meticulously（adv. 细致地；一丝不苟地；拘泥地)

Question 60

out

Answer 60

out/ aut/prep. 向；离去 【前缀】超过；外,向外outwards(ad.向外，往海外)

Question 61

ov

Answer 61

ov【词根】蛋；卵oval(a.卵形的 )

Question 62

over

Answer 62

over/ 5EuvE/adv. 结束；越过【前缀】过度；在……上面overwhelming(a.压倒的，势不可挡的)词根释义：excessive, above例词：overwork,overall,overwork

Question 63

own

Answer 63

own/ Eun/ 自己的;词根：拥有owner(n. 所有者；物主)

Question 64

ox

Answer 64

ox【词根】氧dioxide(n. 二氧化物)

Question 65

oxy

Answer 65

oxy【词根】氧oxygen(n. 氧气，氧)