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            SAT官方每日一题附答案和解析[数学](2019年8月15日)

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            Mathematics

            Black-footed ferrets are the only ferret species native to North America, but they were nearly extinct in the 1970s. Since then, efforts have been made to breed the ferrets in captivity and reintroduce them to the wild. The function f represents the current total population of black-footed ferrets in North America t years after 1991.

            f(t)=51.35*1000^(2t/125)

            To the nearest year, how many years did (or will) it take for the population to be 10 times larger than it was in 1991?

            A.4 years
            B.21 years
            C.51 years
            D.63 years

            重点单词   查看全部解释    
            extinct [iks'tiŋkt]

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            adj. 灭绝的,熄灭的,耗尽的

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            current ['kʌrənt]

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            n. (水、气、电)流,趋势
            adj. 流通的

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            equation [i'kweiʃən]

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            n. 相等,方程(式), 等式,均衡

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            ferret ['ferit]

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            n. 白鼬,雪貂,侦探 v. 用雪貂打猎,搜出,驱出

             
            approximately [ə'prɔksimitli]

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            adv. 近似地,大约

             
            factor ['fæktə]

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            n. 因素,因子
            vt. 把 ... 因素包括

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            population [.pɔpju'leiʃən]

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            n. 人口 ,(全体)居民,人数

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            species ['spi:ʃiz]

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            n. (单复同)物种,种类

             
            function ['fʌŋkʃən]

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            n. 功能,函数,职务,重大聚会
            vi. 运行

             
            

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