1.aurora n．极光(bands of coloured light seen in the sky at night near the North Pole and caused by electrical radiation)

注意：aurore(a.朝霞色的)

例:Displays of the aurora borealis(北极光)can heat the atmosphere over the arctic.

2.austere a.严格的，节制的(strict or severe in discipline)

词根记忆：au+ster(冷)+e--冷面孔--严格的

例:The austere professor never smiled.//The austere budgets have caused the slowdown in the growth in state spending.

派生词:austerity(n.严格；国家开支上的紧缩)

3.authentic a．真正的(genuine; real);法律证实的(legally attested)

词根记忆：authent( =author作家)+ic一自己就是作家一真正的

例:Although many art patrons can readily differentiate a good debenture from an undesirable one, they are much less expert in distinguishing good paintings and poor ones, or authentic art and fakes.

派生词:authentically( ad.真正地：确实地)

4.authenticate v.证明…是真的(to confirm)

词根记忆：来自authentic(a．真的：真正的)

例:We authenticate the coins we sell through a nationally recognized firm.

派生词:authentication(n.证明，鉴定)

5.authoritative a.威台勺，官方的(having or proceeding from authority);专断白勺(dictatorial)

词根记忆：来自authority(n.权威)

例:Authoritative parents are more likely than permissive parents to have children who as adolescents are self-confident, high in self-esteem, and responsibly independent.

派生词:authoritatively(ad.权威地：命令式地)

6.authority n.权力(power);[pl.]当局，权威（person or group having the power）

词根记忆：author(权力)+ity--权力

例:The best strategy for managing a business, or any enterprise, is to give them as much authority as possible.

同根词：authoritarian(a．独裁的)；authoritative(a．有权威的，命令的)

7.authorize v.授权（to grant authority or power to）；批准，认可（to ratify）

词根记忆：author(权力)+ize--把权力下放--授权;批准

例:authorize a loan批准贷款

派生词:authorized(a．经授权的)

8.autobiography n.自传(story of a person's life written by that person)

词根记忆：auto(自己)+bio(生命)+graphy(写)--写自己的一生--自传

例:Current feminist theory, has encouraged scholars of women's history to view the use of women's oral narratives as the methodology, next to the use of women's written autobiography.

9.automate v.（使）自动化(to convert to largely automatic operation)

词根记忆：auto(自己)+mat(动)+e--自己动--自动化

例:Many corporations that have failed to automate have seen their profits decline.

派生词:automatic(a．自动的；机械的)；automation(n．自动化)

10.automatic a.自动宜勺(having a self-acting or self-regulating mechanism);无意识的(largely or wholly involuntary)

词根记忆：auto(自己)+mat(动)+ic（…的）--自动的

例:Airline executives are convinced that, just as one-third of bank customers still prefer human tellers to automatic teller machines, many travelers will still use travel agents.

派生词:automatically(ad.自动地：机械地)

同根词：autonomy(n.自治；自治权)