Aa(an)art.abandonv.abilityn.ablea.abnormala.aboardprep.abolishv.abortionv.aboutad.prep.aboveprep.a.ad.abroadad.abrupta.absencen.absenta.absolutea.absorbv.abstracta./n.absurda.abundanta.abusev.academica./n.academyn.acceleratev.accentn.acceptvt.accessn./v.accessiblea.accidentn.accommodationn.accompanyv.accomplishv.accordingtoad.accountn.accountantn.accumulatev.accuracyn.accusev.accustomeda.achevi.&n.achievevt.achievementn.acida.acknowledgev.acquaintancen.acquirev.acquisitionn.acren.acrossprep.actn.v.actionn.activea.activityn.actorn.actressn.actuala.acutea.ADn.ad(缩)=advertisementadaptv.adaptationn.addvt.addicteda.additionn.addressn.adequatea.adjustv.adjustmentn.administrationn.admirablea.admirev.admissionn.admitvt.adolescencen.adolescentn.adoptv.adorev.adultn.advancev.advantagen.adventuren.advertisevt.advertisementn.advicen.advisevt.advocatev.aeroplanen.(英)affairn.affectvt.affectionn.affordvt.afraida.African.Africana.n.afterad.prep.conj.afternoonn.afterward(s)ad.againad.againstprep.agen.agencyn.agendan.agentn.aggressionn.aggressivea.agoad.agreev.agreementn.agriculturala.agriculturen.aheadad.aidn.AIDSn.aimn.v.airn.aircraftn.airlinen.airmailn.airplanen.（美）airportn.airspacen.alarmn.albumn.alcoholn.alcoholica.n.algebran.alikead.alivea.allad.pron.allergic a.
alley n.
allocate v.
allow vt.
allowance n.
almost ad.
alone a.
along ad. prep.
alongside ad.
aloud ad.
alphabet n.
already ad.
also ad.
alternative a.
although conj.
altitude n.
altogether ad.
aluminium n.
always ad.
am v. be 的人称形式之一
ａ.m./A.M. n.
amateur a.
amaze v.
amazing a.
ambassador (ambassadress) n.
ambiguous a.
ambition n.
ambulance n.
America n.
American a. n.
among prep.
amount n. v.
ample a.
amuse vt.
amusement n.
analyze v.
analysis n.
ancestor n.
acchor v. n.
ancient a.
and conj.
anecdote n.
anger n.
angle n.
angry a.
animal n.
ankle n.
anniversary n.
announce vt.
announcement n.
annoy vt.
annual a.
another a. pron.
answer n. v.
ant n.
Antarctic a.
the Antarctic
Antarctica n.
antique n.
anxiety n.
anxious a.
any pron.
anybody pron.
anyhow ad.
anyone pron.
anything pron.
anyway ad.
anywhere ad.
apart ad, a.
apartment n. （美）
apologize vi.
apology n.
apparent a.
appeal v.
appear vi.
appearance n.
appendix n.
appetite n.
applaud v. n.
apple n.
applicant n.
application n.
apply v.
appoint v.
appointment n.
appreciate v.
appreciation n.
approach n. v.
appropriate a.
approve v.
approximately ad.
apron n.
arbitrary a.
arch n.
architect n.
architecture n.
April n.
Arab a. n.
Arabic a. n.
Arctic a.
the Arctic
the Arctic Ocean
are v.(be)
