Question of the Day. Can you answer today's question? 这就是SAT考试官网collegeboard的每日一题的训练。SAT考试不像托福、雅思或者GRE、GMAT考试，会有回忆机经，因此官网上的SAT真题就显得尤为重要。SAT考试官方每日一题可以让你熟悉SAT考试的出题方向及出题规律，有很大的参考价值，是每一位SAT考生都需要的备考资料。

　　楷维留学小编为大家整理2014年1月13日SAT考试官方每日一题解析，希望对大家备考SAT考试有所帮助。

2014年1月13日SAT真题

　　Mathematics > Standard Multiple Choice 数学选择

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

　　In the figure above, a shaded circle with diameteris tangent to a large semicircle with diameterat pointsand. Pointis the center of the semicircle, andis perpendicular to. If the area of the large semicircle is, what is the area of the shaded circle?

　　(A)

　　(B)

　　(C)

　　(D)

　　(E) It cannot be determined from the information given.

2014年1月13日SAT考试官方每日一题答案：C

解析：Segment is a radius of the large semicircle, and it is also a diameter of the shaded circle, so the radius of the large semicircle is equal to twice the radius of the shaded circle. Let be the radius of the shaded circle. Then is the radius of the large semicircle, and so the area of the semicircle is . This area is given as , and so the area of the shaded circle is .

　　为大家提供与2014年1月13日SAT真题同类题型的一道题目，供各位考生练习：

　　A train travelingmiles per hour forhour covers the same distance as a train travelingmiles per hour for how many hours?

　　(A)

　　(B)

　　(C)

　　(D)

　　(E)

解析：When the speed of a train in miles per hour is multiplied by the travel time in hours, the distance traveled by the train is obtained. The distance that the first train travels ismiles per hour timeshour, which ismiles. Using the variablefor the travel time, in hours, of the second train, the distance that the second train travels ismiles per hour timeshours, which ismiles. Since the two trains travel the same distance,, which giveshours, the travel time of the second train.