为广大SATer带来SAT数学每日一练（六），考察对幂函数的理解，配有答案，解析，众考生，慢慢练习吧。

　　SAT语法每日一练

　　F(t)=0.95^(t/2)

　　The function F(t) gives the percentage, as adecimal, ofinformationDianna remembered t days after memorizing lines for a play. Assuming she did not work on her lines again, what is the best interpretation of themeaningof the function F in this context?

　　A.On any given day, Dianna will forget 95% of the lines 1 day after she memorizes them.

　　B.On any given day, Dianna will forget 95% of the lines 2 days after she memorizes them.

　　C.On any given day, Dianna will remember 95% of the lines 1 day after she memorizes them.

　　D.On any given day, Dianna will remember 95% of the lines 2 days after she memorizes them.

　　答案：D

　　解析：

　　Option D is correct. After 2 days, the exponent of the function will be 2/2=1. Dianna will remember (0.95^1)*100 or 95% of the lines.

　　SAT数学每日一练推荐词汇

　　context['kɔntekst]n. 上下文，环境，背景

　　interpretation[in.tə:pri'teiʃən]n. 解释，阐释，翻译，(艺术的)演绎

　　option['ɔpʃən]n. 选择权，可选物，优先购买权 v. 给予

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

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

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