【官方】SAT数学每日一题附答案和解析(2018年1月4日)

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每日一练

MathematicsStandard Multiple Choice

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

your answer.

F(t)=0.95^(t/2)

The function F(t) gives the percentage, as a decimal, of information Dianna

remembered t days after memorizing lines for a play. Assuming she did not work

on her lines again, what is the best interpretation of the meaning of 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.