下面是2013年12月18日的SAT官方每日一题的内容，是关于数学方面的，题型是选择。SAT官方每日一题是collegeboard每天都会发布的题目，关于SAT考试的三个部分的各个题型。大家和无忧小编一起来看一下这个SAT官方每日一题吧。

　　SAT官方每日一题之数学---选择：

　　Mathematics > Standard Multiple Choice

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

　　The circle above has center. Given segments of the following lengths, which is the length of the longest one that can be placed entirely inside this circle?

　　(A)

　　(B)

　　(C)

　　(D)

　　(E)

　　The correct answer is C

　　Explanation

　　Since the radius of the circle is, the diameter of the circle is. In a circle, the diameter is longer than any segment that can be placed entirely inside the circle. Therefore, segments of lengthor lengthcould not be placed entirely within the circle, and the correct answer is.

　　下面为大家提供一些和这些SAT官方每日一题相似的题目，供大家练习：

　　Four distinct lines lie in a plane, and exactly two of them are parallel. Which of the following could be the number of points where at least two of the lines intersect?

　　. Three

　　. Four

　　. Five

　　(A)only 

　　(B)only

　　(C)andonly 

　　(D)andonly

　　(E),, and 

　　The correct answer is D

　　Explanation

　　Since exactly two of the four lines are parallel, the other two lines are not parallel. If the two non-parallel lines intersect at a point that is not on either one of the parallel lines, then the configuration of lines will give a total ofpoints of intersection. (The best way to verify this is by drawing the two parallel lines and then putting in the other two lines.) If, on the other hand, the two non-parallel lines intersect at a point that is on one of the parallel lines, then there will be a total ofpoints of intersection in the figure. (Again, a sketch is the best way to verify this.) Any arrangement of the four lines will again yield eitherorpoints of intersection. Since you can’t obtain four points of intersection, the correct answer isandonly.

　　以上就是关于2013年12月18日SAT官方每日一题中数学部分的详细内容，包括了题目和选项以及答案，后面附有一道相关的练习题。大家可以在备考SAT的过程中关注SAT每日一题的内容，这样就可以更好有不间断的练习，也就能在日积月累的过程中得到提高。