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52. per prep.每，每一
Potatoes cost 1 dollar per pound.土豆每磅一美元。
How many words can you type per minute? 你每分钟可打多少字?
53. positive a. ①肯定的
Are you positive she’s the person you danced with last Saturday? 你肯定她就是上周跟你跳过舞的那人吗？
We still don’t have a positive answer as to how he died.他是怎么死的我们还说不准。
②积极的
The boss sang high praise for our positive thinking.老板对我们的积极思考大为赞赏。
It’s no use just telling me to do it; give me positive advice as how to do it.只告诉我做什么没用，请在做法上给我一些具体指导。
54. potential a.可能的，潜在的
I dare say every seed is a potential plant.我敢说每颗种子都会长成植物。
He is seen as a potential winner in the game.大家都认为他将是比赛的获胜者。
n.潜力
Your daughter certainly shows the potential to become a good singer.你女儿当然很有希望成为一名好歌手。
He is a young player with great potential.他是一位有很大潜力的年轻选手。
55.predict v.预测，预言
He predicted that she would become an excellent dancer.他预言她会成为一个很棒的舞蹈家。
Can you predict when the task will be fulfilled? 你能预测什么时候完成任务吗？
56.profit n. ①利润
They sold the coal mine at a profit.他们把煤矿卖掉赚了钱。
Did she make any profit on the sale? 她做这次买卖挣到钱了吗？
②利益，好处
We’re reading for both profit and pleasure.我们阅读既是为得到好处也是为愉悦。
You could with profit spend some extra time learning a foreign language.你额外花些时间学习外语是有好处的。
57.purchase v.购买，购置
Have you considered purchasing a new house by the river? 你考虑过买幢河边的房子吗？
We were encouraged to purchase shares in that firm.鼓励我们购买那家公司的股票。
58.quality n.质量，性质
I insist that we use building materials of high quality.我坚持用质量高的建筑材料。
He shows real quality as an actor.作为演员他表现出真正的表演才华。
59.quit v.停止，放弃
They’ve quit working on the project of the dam.他们已经停下了修建大坝的工作。
I’ll quit if I don’t get a pay rise.如果不给我加薪我就不干了。
60.rank n.职衔，军衔
He asked what your rank was.他问你的军衔是什么。
Is your husband above or below a major in rank? 你丈夫的军阶在上校之上还是之下？
61.rate n.率，比率
The birth rate is the number of births compared to the number of the people of some area in a certain time.出生率是某一时间某个地方新出生的人数跟人口数的比率。
So far the spacecraft’s been traveling at a steady rate.到目前为止飞船一直在以稳定的速度飞行。
v.认为，估价
We all rate him highly as a novelist.我们都认为他是很棒的小说家。
What do you rate her income at? 你估计她的收入有多少？
