1 / a better / an improved / 更好的

2 / a branch / a division / 分支(机构)

3 / a plentiful / an abundant / 丰富的

4 / abandon / give up / 放弃

5 / abide by / stick to / 坚持，遵循

6 / abnormal / unusual / 不正常的

7 / abrupt / sudden / 突然的

8 / accelerate / step up / 加快

9 / acceptably / satisfactorily / 令人满意

10 / acclaim / hail / 向……欢呼

11 / account / consideration / 要考虑的事

12 / account for / explain / 解释

13 / accumulate / collect / 积聚

14 / aircraft / planes / 飞机

15 / alleviate / lessen / 减轻

16 / allocate / assign / 分配

17 / allocate / distribute / 分配，分布

18 / allow / permit / 允许

19 / almost / practically / 几乎

20 / although / while / 引导让步从句

21 / annoying / irritating / 使不愉快

22 / argue / contend / 争辩

23 / arise / get up / 起床

24 / arouse / excite / 使激动

25 / assemble / gather / 聚集

26 / assert / state firmly / 断言

27 / assume / postulate / 假定

28 / at any price / for love or money / 不惜任何代价

29 / at stake / in danger / 在危险中

30 / attend to / wait on / 伺候