- 语音知识
- 完形填空
- 单词辨析
- oak
- oar
- oasis
- obedient
- obese
- obesity
- obey
- object
- objection
- obligation
- oblige
- oblivious
- obscene
- obscure
- observation
- observational
- observatory
- observe
- observer
- obsess
- obstacle
- obtain
- obvious
- obviously
- occasion
- occasionally
- occupant
- occupation
- occur
- ocean
- Oceania
- Oceanian
- oclock
- o
- Oct.
- October
- octopus
- odd
- ode
- odour
- odourless
- of
- off
- offence
- offend
- offender
- offending
- offensive
- offer
- offering
- office
- officer
- official
- official-looking
- officially
- offshore
- often
- oh
- oil
- oiled
- oilfield
- ointment
- OK
- okay
- Okay
- old
- older
- old-fashioned
- olive
- Oliver
- Olympia
- Olympian
- Olympic
- Olympic(s)
- Olympics
- omelette
- omit
- on
- on(开着的 adj.)
- once (曾经/一次)
- once (一旦…)
- oncoming
- one
- ones
- oneself
- onion
- + online
- only
- onto
- onwards
- oolong
- oops
- open (adj. 营业的，开放的)
- open (打开)
- open (开着的)
- opener
- opening
- openly
- opera
- Opera-house
- operate
- operation
- operational
- operator
- opinion
- opinionated
- opponent
- opportunity
- oppose
- opposing
- opposite
- opt
- optics
- optimism
- optimist
- optimistic
- option
- optional
- optometrist
- or (否则)
- or (或者)
- oral
- orally
- orange
- orange (橙色n.)
- orange (橙色的)
- orange (橙子)
- orange-and-white
- orangutan
- orbit
- orchard
- orchestra
- order (点餐)
- order (订单/订货 n.)
- order (命令 n.)
- order (命令 v.)
- order (顺序)
- order (预定/订购/订货/订座)
- orderly
- ordinary
- organ
- organic
- organisation
- organise(organize)
- organised
- organiser(organizer)
- organism
- organization
- organizational
- organize
- organized
- organizer
- orient
- oriental
- origin
- original
- originally
- ornate
- orphan
- orphanage
- orthodoxy
- Oscar
- ostrich
- other(其他的，另外的 adj.)
- others
- otherwise
- Ottawa
- ouch
- ought
- our
- ours
- ourselves
- out
- outback
- outbreak
- outcome
- outdoor
- outdoors
- outer
- outerspace
- outfit
- outgoing
- outing
- outlandish
- outlet
- outline
- outlook
- outnumber
- outpatient
- output
- outrageous
- outside
- outsider
- outspoken
- outstanding
- outstrip
- outward
- outwards
- oval
- oven
- over (多于…/超过…)
- over (结束)
- over (在……期间)
- over (在…之上/横跨)
- over (在那边/在另一处)
- overall
- overbearing
- overboard
- overcoat
- overcome(overcame overcome)
- overcrowded
- overcrowding
- overdevelop
- overdo
- overdue
- overeat
- overeating
- over-emotional
- overfill
- over-fishing
- overflow
- overhead
- overhear
- overlap
- overlook
- overnight
- overrun
- oversea
- overseas
- oversleep
- overstimulate
- over-there
- overthrow
- overtime
- overturn
- overuse
- overview
- over-wear
- overweigh
- overweight
- overwhelmed
- owe
- owl
- own
- owner
- ownership
- ox(oxen)
- oxen
- Oxford
- oxide
- oxygen
- oyster
- ozone
- 短语辨析
- 词汇知识
- 阅读理解
- 补全对话
- 翻译
- 短文/单句改错
- 语篇范围
- 写作
- 其它（教材同步资料）
- 回收站
很抱歉，暂时没有该知识点下的试题，等待我们的收集吧o(╥﹏╥)o