- 语音知识
- 完形填空
- 单词辨析
- U.K.(United Kingdom)
- U.S.
- U.S.A.(the United States of America)
- UFO(unidentified flying object)
- Uganda
- ugh
- ugly
- UK
- ultimate
- ultraviolet
- um
- umbrella
- UN(the United Nations)
- unable
- unaware
- unbearable
- unbelievable
- unblock
- unbutton
- + uncertain
- unchangeable
- uncle
- unclear
- uncomfortable
- uncomfortably
- uncommon
- unconditional
- unconscious
- unconsciously
- uncontrolled
- uncooperative
- uncover
- uncross
- uncrowded
- undamaged
- under
- underdog
- undereat
- underestimate
- undergo
- undergraduate
- underground (地铁)
- underground (地下的)
- undergrowth
- underline
- underneath
- underpants
- underpass
- undershirt
- understand(understood understood)
- understanding
- undertake(undertook undertaken)
- underwater
- underway
- underwear
- undisturbed
- undivided
- undo
- undoubted
- undoubtedly
- undue
- unearth
- uneasy
- unemployed
- unemployment
- uneven
- unexpected
- unexpectedly
- unexplained
- unexplored
- unfair
- unfaithful
- unfamiliar
- unfinished
- unfit
- unfold
- unforgettable
- unfortunate
- unfortunately
- unfriendly
- ungrateful
- unhappily
- unhappiness
- unhappy
- unhealthy
- unhelpful
- unhygienic
- UNICEF
- unicorn
- unification
- uniform
- unimaginable
- unimportant
- unimportantly
- uninhabited
- unintentionally
- uninteresting
- union
- unique
- uniqueness
- unit
- united
- universal
- universe
- university
- unjust
- unkind
- unknown
- unleaded
- unless
- unlike
- unlikely
- unload
- unloving
- unluckily
- unlucky
- unmanned
- unmarried
- unnecessarily
- unnecessary
- unnoticed
- unpaid
- unpainted
- unpleasant
- unpopular
- unpredictable
- unprepared
- unprofessional
- unprotected
- unpunished
- unrealistic
- unreasonable
- unrecognisable
- unrest
- unsafe
- unsettling
- unskilled
- unspoken
- unsuccessful
- unsuitable
- unsung
- unsure
- untidy
- untie
- until
- untreated
- untrue
- unusable
- unusual
- unwanted
- unwary
- unwelcome
- unwilling
- unwise
- unzip
- up
- upbringing
- up-close
- update
- updated
- upgrade
- upon
- upper
- upright
- upset
- upset(upset upset)
- upsetting
- upstairs
- up-to-date
- uptown
- upward
- upward(s)
- urban
- Urdu
- urge
- urgent
- us
- US
- USA
- usage
- use
- useable
- used (已适应/已习惯)
- used (已用的/二手的/用旧了的)
- useful
- useless
- user
- USSR(Union of Soviet Socialist Republics)
- usual
- usually
- Utah
- Utopia
- utter
- utterance
- utterly
- U-turn
- Uygur
- 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