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Read the following SAT test question and thenclick on a button to select your answer.
According to a standard weather table, when the airtemperature is 59 degree Fahrenheit (°F) at sealevel, the air temperature is 48.3°F at an altitude 3,000 feet (ft) above sea level. If airtemperature depends linearly on altitude, then which of the following gives the airtemperature, T, in °F, as a function of altitude, h, in feet?
A.T(h)=59-3.6h
B.T(h)=59-10.7h
C.T(h)=59-0.0107h
D.T(h)=59-0.0036h
重点单词讲解：
bacteria [bæk'tiəriə] n. (复数)细菌
calculated ['kælkjuleitid] adj. 计算出的;适合的;
temperature ['tempritʃə(r)] n. 温度，气温，体温，发烧
initial [i'niʃəl] n. (词)首字母
altitude ['æltitju:d] n. 高度，海拔，高地
option ['ɔpʃən] n. 选择权，可选物，优先购买权
approximately [ə'prɔksimitli] adv. 近似地，大约
function ['fʌŋkʃən] n. 功能，函数，职务，重大聚会
multiple ['mʌltipl] adj. 许多，多种多样的
答案：D
解析：
Option D is correct. The rate of change can becalculated by subtracting 48.3 from 59 and thendividing by 3000. Therefore, the rate of change isapproximately 0.0036, and the initial value for Tat sea level is 59°F.