同chief, foremost, prime, main, leading
The principal aim of this plan is to find a way to help students improve their study habits.
同evasion, equivocation, sophism
David has a quibble with my idea of buying new computers for the office.对我提出为办公室购买新电脑一事，戴维避而不答。
同widespread, rife, uncontrollable, excessive
You cannot allow children to rampant through the museum.
同unwilling, loath, averse, hesitant
Bert was reluctant to tell his mother the washing machine was broken again.伯特不愿告诉母亲洗衣机又坏了。
同withdraw, recede, draw back
The soldiers retreated back to their camp in the hills.
同1.confirmation, permission 2.boycott, penalty
The city government gave its sanction to the library to build a new wing.市政府批准图书馆兴建新的分馆。
Our building plans suffered a setback when a strong typhoon destroyed our building site.
同stain, besmirch, smudge
The children playing outside had smeared mud all over their clothes, faces and hands.
同incite, arouse, instigate, stir up
Her coach‘s encouragement helped spur Heather to run faster and win the race.
同strict, exacting, severe, forceful, rigorous
The military is famous for its stringent regulations of dress and behavior.军队以其严格的着装要求和行为规范而著称。www.59wj.com
同excel, outdo, exceed
Tommy studied so hard that he surpassed all the other students in his class.
同slave, serf, bondsman
The peasant farmers were the thralls of the lord of the castle.
同fearful, cowardly, shy
The tiny kitten was very timid, and too afraid to approach us.
同modest, retiring, reversed, humble
Don‘t be fooled by his unassuming manner; he is really a very proud man.别被他谦虚的态度骗了，其实他是个很骄傲的人。
同dauntless, brave, courageous, gallant, valorous
The doctor‘s valiant efforts finally saved the child‘s life.
同pale, pallid, colorless, bloodless, ashen
Tony looked so wan and tired that I knew something must be wrong.
同bond, chain, link, tie, union
The farmer put a yoke on the oxen‘s necks and began to plow his fields.农夫把轭套在牛的脖子上，开始耕田。
Exercise: Fill in the blanks.
1. The _____ spread of the disease caused panic among the people of the country.
2. Although she was _____ to go, Tina came to the Assassin concert with me.
3. There were many _____ in organizing the business conference, but we finally succeeded.
4. Allan, who is anything but _____, often strikes up conversations with complete strangers.
5. Although she is a very accomplished pianist, she has a very _____ personality.
解答：1. Rampant 2. Reluctant 3. Setbacks 4. Timid 5. unassuming www.59wj.com 如果觉得《《托福高阶词汇》LIST15》托福词汇考试指导,tofu不错，可以推荐给好友哦。