新SAT官方Daily Practice每日一题数学函数题

2017年07月27日13:12 来源：小站教育作者：小站SAT编辑

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Read the following SAT test question and then click on a button to select your answer.

7月SAT数学官方Daily Practice 每日一练，点击练习

The government of a particular country is planning to subsidize electric vehicles by lowering their prices in order to encourage consumers to purchase them. Electric vehicles are currently being purchased steadily at a rate of about 287 per month, with an average purchase price of$24627. For each drop of $1000 in the average electric vehicle's purchase price, it is expected that the monthly purchase rate will increase by 48. Which of the following best models the monthly electric vehicle revenue, R(p), in this country as a function of p price reductions of$1000 each?

(revenue=price of product*number of product)

A.R(p)=24627(287-952p)

B.R(p)=1000(24627-p)(287+48p)

C.R(p)=(24627-p)(287+p)

D.R(p)=(24627-1000p)(287+48p)

重点单词：

purchase ['pə:tʃəs]vt. 买，购买n. 购买，购买的物品

encourage [in'kʌridʒ]vt. 鼓励，促进，支持

function ['fʌŋkʃən]n. 功能，函数，职务，重大聚会vi. 运行

vehicle ['vi:ikl]n. 车辆，交通工具，手段，工具，传播媒介

multiple ['mʌltipl]adj. 许多，多种多样的n. 倍数，并联

particular [pə'tikjulə]adj. 特殊的，特别的，特定的，挑剔的

subsidize ['sʌbsidaiz]vt. 给与补助金或奖助金，贿赂

答案：D

解析：

Choice D is correct.