【官方】SAT数学每日一题附答案和解析(2018年1月26日)

小站整理2018-01-31 13:18:48

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摘要：每日一题的内容是由sat官方所出，质量虽不比真题，但备考期间，由于有效备考资料珍贵有限。大家可以每天拿官方的Daily Practice来练手。以下是2018年1月26日的数学练习部分：

每日一练

Mathematics>Standard Multiple Choice

Read the following SAT test question and thenclick on a button to select your answer.

During the process of radioactive decay, a "parent" material produces a new "daughter" material, whichfurther decays into a stable material. During an experiment involving radioactive decay, themass M, in micrograms, of daughter material changes over time t, measured in hours asshown in the graph above. What is the significance of the point shown on the graph?

答案：D

解析：

Choice D is correct. The point indicated is the highest point on the graph. Since t represents the time in hours since the daughter material was created and M represents the mass of the daughter material, the point shows the values of t and M when M is greatest. Therefore, the point shows the maximum mass of the produced substance and the number of hours since it was created that its mass reached this maximum.

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