专业英语八级

oak oar oasis oath oats obedience obedient obese obesity obey obituary object objection objective obligation obligatory oblige obliterate oblivion oblivious oblong oboe obscene obscenity obscure obscurity observance observant observation observatory observe observer obsess obsessive obsolete obstacle obstinate obstruct obstruction obtain obvious occasion occasional occidental occupancy occupation occupational occupy occur occurrence oceanography October octopus odd odds ode odour of off offence offend offender offensive offer offhand office officer offset offshore offspring often oh oil oily ointment okay old olive Olympic omega omelette omen ominous omission omit omniscient on once one oneself ongoing onion online onlooker only onset onslaught onto onward onwards ooze opal opaque open opener opening opera operate operation operational operative operator opinion opium opponent opportunity oppose opposite opposition oppress oppressive opt optical optics optimal optimise optimism optimistic optimum option optional opulent or oracle oral orange orator orbit orbital orchard orchestrate orchid ordain ordeal order orderly ordinal ordinance ordinary ore organ organic organisation organise organism orgasm orgy orient oriental orientation origin original originality originate ornament ornate orphan orphanage orthodox orthodoxy oscillation ostensibly ostentatious ostrich other otherwise ought ounce our ours ourselves oust out outbreak outcast outcome outcry outdated outdoor outdoors outer outfit outgoing outgrow outing outlandish outlaw outlay outlet outline outlook outnumber outpost output outrage outrageous outreach outright outset outside outskirts outspoken outstanding outward outwards outweigh oval ovation oven over overall overboard overcast overcoat overcome overcrowd overdo overdose overdraft overdue overflow overgrown overhear overjoyed overlap overleaf overlook overly overnight override overrule oversea overseas overshadow oversight overstate overt overtake overthrow overtime overture overturn overview overweight overwhelm overwhelming ovum owe owing owl own owner ownership ox oxide oxidize oxygen oyster ozone