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The Official SAT Question of the Day: December 06-07, 2013——2013年12月6日至12月7日SAT考试官网每日一题，希望对大家备考SAT考试有所帮助。

2013年12月6日SAT真题类型：Mathematics > Standard Multiple Choice 数学选择

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

　　The sum of the positive odd integers less thanis subtracted from the sum of the positive even integers less than or equal to. What is the resulting difference?

　　(A)

　　(B)

　　(C)

　　(D)

　　(E)

2013年12月6日SAT考试官方每日一题答案：B

解析：The sum of the positive odd integers less than is , and the sum of the positive even integers less than or equal to is . When the first sum is subtracted from the second, the terms can be regrouped to form , which is just , where there are ones. Therefore, the correct answer is .

2013年12月7日SAT真题类型：Critical Reading > Sentence Completions 完成句子

　　Choose the word or set of words that, when inserted in the sentence, best fits the meaning of the sentence as a whole.

　　Bromelain, an enzyme found in pineapples, is not ------- in preventing bone and joint diseases, which can make bones susceptible to injury, but it can help injured bones -------.

　　(A) corrective . . heal

　　(B) effective . . recover

　　(C) detrimental . . multiply

　　(D) supportive . . degenerate

　　(E) vital . . persist

2013年12月7日SAT考试官方每日一题答案：B

解析：It makes sense to say that although bromelain is not “effective” against, or cannot prevent, bone injury, it is effective in helping injured bones “recover.”