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。下面我们就一起来看一下2015年5月17日SAT官方每日一题吧。
Choose the word or set of words that, when inserted in the sentence, best fits the meaning of the sentence as a whole.
While a “rock” is usually defined as ------- , or a combination, of one or more minerals, geologists often ------- the definition to include such materials as clay, loose sand, and certain limestones.
(A) a conglomeration . . limit
(B) an aggregate . . extend
(C) an element . . eliminate
(D) a blend . . restrict
(E) a product . . provide
Explanation
Choice (B) is correct. If these terms were inserted into the sentence, the sentence would read, “While a 'rock' is usually defined as an aggregate, or combination, of one or more minerals, geologists often extend the definition to include such materials as clay, loose sand, and certain limestones.” An “aggregate” is the sum total of a combination of things, so a “rock” is an aggregate of one or more minerals. In addition to minerals, geologists feel confident including other materials such as “clay, loose sand, and certain limestones” in their definition of a rock; they “extend,” or broaden, the definition.
以上就是关于2015年5月17日SAT官方每日一题中填空题的详细内容，是SAT阅读部分的词汇题。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。
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