# SAT官方每日一题附答案和解析[数学](2019年9月4日)

Mathematics>Standard Multiple Choice

Scarlett is studying the neurology of mice. One article she reads suggests that the number of neurons a mouse has， N(t)， after t months is modeled by the function N(t)=N0*(1-r)^(t/τ)， where N0 is the initial number of neurons at time t=0， r is a rate where 0＜r＜1， and τ， measured in months， is a constant. If τ is 4 months， which of the following statements would best describe the relationship between the number of neurons and the number of months t that have passed since N0 was measured？

A.The number of neurons decreases by a fixed amount every 4 months.
B.The number of neurons remaining increases by a fixed amount every 4 months.
C.The number of neurons decreases by an amount proportional to the decrease in the previous 4 months.
D.The number of neurons increases by an amount proportional to the increase in the previous 4 months.

 重点单词 查看全部解释 describe [dis'kraib] 想一想再看 vt. 描述，画(尤指几何图形)，说成 联想记忆 function ['fʌŋkʃən] 想一想再看 n. 功能，函数，职务，重大聚会vi. 运行 initial [i'niʃəl] 想一想再看 n. (词)首字母adj. 开始的，最初的， 联想记忆 multiple ['mʌltipl] 想一想再看 adj. 许多，多种多样的n. 倍数，并联 联想记忆 constant ['kɔnstənt] 想一想再看 adj. 经常的，不变的n. 常数，恒量 联想记忆 measured ['meʒəd] 想一想再看 adj. 量过的，慎重的，基于标准的，有韵律的 动词me neurology [njuə'rɔlədʒi] 想一想再看 n. 神经学，神经病学 previous ['pri:vjəs] 想一想再看 adj. 在 ... 之前，先，前，以前的 联想记忆
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