下面是2015年3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。

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

　　Laboratories have been warned that provisions for animal protection that in the past were merely ------- will now be mandatory;------- of this policy will lose their federal research grants.

　　(A) comprehensive . . adversaries

　　(B) nominal . . advocates

　　(C) disregarded . . proponents

　　(D) recommended . . violators

　　(E) compulsory . . resisters

　　The correct answer is D

　　Explanation

　　The word “merely” indicates that the past provisions were not as strict as the “mandatory” provisions and “recommended” is the only first term that conveys a lesser degree of strictness. Only “violators” could logically be penalized by losing their federal research grants.

　　以上就是关于2015年3月21日的SAT官方每日一题中完成句子的详细内容，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。

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