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SAT考试官方真题每日一题解析，此次整理2014年4月25日-4月26日SAT考试官网每日一题汇总。希望对大家备考SAT考试有所帮助。

2014年4月25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.

　　A jar contains only red marbles and green marbles. If a marble is selected at random from the jar, the probability that a red marble will be selected is. If there aregreen marbles in the jar, how many red marbles are there in the jar?

　　(A)

　　(B)

　　(C)

　　(D)

　　(E)

2014年4月25日SAT考试官方每日一题答案：D

解析：Choice (D) is correct. Let be the number of red marbles in the jar. The probability of selecting a red marble is equal to the number of red marbles divided by the total number of marbles. Since the probability of selecting a red marble is , it follows that . There are  green marbles and red marbles, so the previous equation becomes . This simplifies to , or . Therefore, the number of red marbles, , is .

2014年4月26日SAT真题

　　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.

　　When, in 1864, a factory established by Alfred Nobel to manufacture nitroglycerin blew up, the scientist discovered that the explosive was as ------- as it was powerful, ------- to detonate without warning.

　　(A) dormant . . ready

　　(B) fickle . . unlikely

　　(C) volatile . . liable

　　(D) unprecedented . . intended

　　(E) inactive . . designed

2014年4月26日SAT考试官方每日一题答案：C

解析：Choice (C) is correct. It makes sense to say that when his factory exploded, Nobel discovered how “volatile,” or unpredictable, nitroglycerin could be; in fact, it was “liable” to, or prone to, detonate unexpectedly.