下面是2014年4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。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.
The jellyfish’s slow pulsing action propels it in a graceful, seemingly ------- drift, but its tentacles contain a poison potent enough to stun a swimming human.
(A) sinister
(B) rhythmic
(C) murky
(D) harmless
(E) patient
The correct answer is D
Explanation
The jellyfish is presented as seeming the opposite of harmful. Only “harmless” fits the logic required by “but.”
下面是一道和SAT官方每日一题相似的题目，供大家练习：
Alvin is an exceedingly ------- person: he unselfishly ------- his friends without ever expecting anything in return.
(A) opportunistic . . supports
(B) noble . . undermines
(C) bemused . . aids
(D) caustic . . neglects
(E) altruistic . . assists
Right! (Applause.)
Explanation
The structure of the sentence indicates that the statement after the colon gives an example of the idea in the first part of the sentence. If Alvin is unselfish, he likely “assists,” or helps, his friends without expecting anything from them in return. And helping people without expecting anything in return is an example of being “altruistic,” or unselfishly concerned with the welfare of others.
以上就是关于2014年4月21日的SAT官方每日一题中阅读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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