文档介绍：ability n. --------
able a.--------
about ad. ---------
      prep. ---------
above prep. ---------
abroad  ad.----------
accept vt. --------------
accident n. -------------
accurate adj.-----------
achieve vt.----,-------
across prep.-------,--------
act n. --------,-------- v. ------,------,
active a.-----,----
activity n. ------
actor n.---------
actress n.---------
actually adv.-------,---------
add  vt.-----,-----
addition n.--------
address n. ------
adopt n.---------,----------
advantage n. -----; ------
advertisement n. ------
advice n.-------,---------,-------
Africa n.---------
afraid a. --------,----------
after adv. -------- prep.--------;------ conj. --------
afternoon n. ---------
again adv. --------,-----,-----
against prep. -------,-----
age n. -------,-----
aged adj.-------,--------
agent n.-----------
ago adv. ----------
agree v. ---------,--------
ahead adv.--------------
aim n. ------------ v.-------
air n. --------,-----------
airline n. --------------
airplane n. ------------
airport n. -------------
alarm n.-------------
alive a. --------------
all  adj. ----------adv.----------
 n. --------- pron. ----------
allow v. ----------,----------
almost adv. ----------,---------
alone adj.-------,adv--------
along  adv. --------;--------;
       prep.----------;---------
already adv.----------
also adv. --------
although conj. ------,-----
always adv. ---------;----------
.(.)-------------
amazing adj.-----------
ambition n.---------,----------
America * n.------;------
American adj. -------;------- n.-------
among prep. --------;--------
amount n. -------,-------
amusement n.------,------,-----
amusing adj.-----------
ancient a.------,-----
and conj.------;-----;------
angrily adv.---------,----------
angry a.-------,------
animal n. -------
another adj. ------;----;----;---- pron.----
answer n. ----,-----;---;-----v. ------,----;-----