下面是是2011年8月21日的SAT官方每日一题的内容，是关于阅读方面的，题型是完成句子。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这个SAT官方每日一题吧。

　　SAT官方每日一题之阅读---完成句子：

　　Critical Reading > Sentence Completions

　　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 dined as ------- , or a combination, of one or more minerals, geologists often ------- the dinition to include such materials as clay, loose sand, and certain limestones.

　　Answer Choices

　　(A) a conglomeration . . limit

　　(B) an aggregate . . extend

　　(C) an element . . eliminate

　　(D) a blend . . restrict

　　(E) a product . . provide

　　The correct answer is B

　　Explanation

　　Choice (B) is correct. If these terms were inserted into the sentence, the sentence would read, “While a &aposrock&apos is usually dined as an aggregate, or combination, of one or more minerals, geologists often extend the dinition 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 dinition of a rock; they “extend,” or broaden, the dinition

　　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：

　　Because King Philip&aposs desire to make Spain the dominant power in sixteenth-century Europe ran counter to Queen Elizabeth&aposs insistence on autonomy for England, ------- was -------.

　　Answer Choices

　　(A) reconciliation . . assured

　　(B) warfare . . avoidable

　　(C) ruination . . impossible

　　(D) conflict . . inevitable

　　(E) diplomacy . . simple

　　The correct answer is D

　　Explanation

　　Difficulty: Hard

　　The word "because" indicates that the information in the first part of the sentence (the part bore the comma) explains the reason for the situation described in the second part. The first part states that what King Philip wanted (domination for Spain) "ran counter to" what Queen Elizabeth wanted (independence for England). Choice (D) logically completes the sentence: Given that there was such a fundamental disagreement between the two monarchs, "conflict" would likely be "inevitable," or unavoidable.

　　以上就是关于2011年8月21日SAT官方每日一题中阅读部分的详细内容，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。

更多SAT官方每日一题：

2011年8月20日SAT官方每日一题---数学

2011年8月19日SAT官方每日一题---写作

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