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课程： A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
- abalone
- abandon
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- abbreviate
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- acid
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- adjoin
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- advertise
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- advice
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- affront
- Afghanistan
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- Africa
- African
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- afternoon
- afterward
- afterwards
- again
- against
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- agree
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- agriculture
- ahead
- aid
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- aie
- ail
- aim
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- aircraft
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- airplane
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- ala
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- Alaska
- Alaskan
- albedo
- alchemist
- alcohol
- alder
- aldosterone
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- alertness
- alga
- algae
- alien
- alienate
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- alive
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- aloft
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- aloud
- alp
- alpha
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- alphabetically
- alpine
- already
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- alumina
- aluminum
- alumnus
- always
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- Amsterdam
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- analogous
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- analysis
- analyst
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- anathema
- anatomy
- ancestor
- ancestral
- ancestry
- anchor
- Andromeda
- anecdotal
- anemone
- anew
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- angiosperm
- angiotensin
- angle
- Anglo
- angry
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- annihilate
- announce
- annual
- annually
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- anonymous
- ant
- antagonism
- antagonistic
- antarctica
- anteater
- antecedent
- antelope
- antenna
- anthocyanin
- anthropological
- anthropologically
- anthropologist
- anthropology
- anthropomorphism
- anti
- antibiotic
- anticipate
- antifungal
- antipathy
- antiquate
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- anxiety
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- anxiously
- anymore
- anyone
- anyplace
- anything
- anytime
- anyway
- anywhere
- apace
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- apiece
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- appointment
- apportion
- appraisal
- appreciable
- appreciably
- appreciate
- appreciation
- apprentice
- approach
- appropriate
- appropriately
- approval
- approve
- approximate
- April
- aptly
- aquatic
- aqueduct
- aquifer
- Arab
- Arabian
- aragonite
- arbitrary
- arboreal
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- arcade
- arch
- archaeocyte
- archaeological
- archaeologist
- archaeology
- archaeopteryx
- archaic
- archipelago
- architect
- architecture
- arctic
- arduous
- arena
- argon
- argue
- argument
- arid
- aridity
- arise
- aristocracy
- aristocrat
- aristocratic
- arm
- armor
- armory
- army
- aromatic
- arousal
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- arrange
- array
- arrest
- arrival
- arrive
- arrow
- arsenal
- arsenic
- arthritis
- arthropod
- article
- articulate
- artifact
- artificial
- artificially
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- artiste
- artistic
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- artistry
- artwork
- ascend
- ascent
- ascribe
- ash
- ashcan
- ashore
- Asia
- Asian
- aside
- ask
- asleep
- aspect
- asphalt
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- assembly
- assert
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- assumption
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- asteroid
- asthenosphere
- astonish
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- astronaut
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- astronomical
- astronomy
- astute
- asymmetrical
- atheist
- Athenian
- Athens
- athlete
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- atlas
- atmosphere
- atmospheric
- atom
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- attributable
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- auction
- audience
- audio
- auditorium
- auditory
- auger
- August
- aural
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- Australia
- Australian
- Austrian
- authentic
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- autobiographical
- autobiography
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- automobile
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- avoid
- avoidable
- avoidance
- await
- awake
- awaken
- award
- aware
- awareness
- away
- awesome
- awful
- awhile
- awkward
- awkwardly
- ax
- axe
