【官方】SAT数学每日一题附答案和解析(2018年1月26日)

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每日一练

MathematicsStandard 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.