为了让我们更好的适应sat考试，sat官网每天都会有sat官方每日一题，下面是小编为您整理的2016年3月21日SAT官方每日一题。
Writing & Language
After reading the passage, choose theanswer to the question that mosteffectively improves the quality ofwriting in the passage or that makesthe passage conform to the conventionsof standard written English. Sometimes the question will include a "NOCHANGE" option. Choose that option if you think the best choice is toleave the relevant portion of the passage as it is.
Some plant pathologists have turned to genetic engineering to devise new ways of responding to botanical diseases. Plant pathologist WilliamPowell, for instance, teamed up with forest biologist Chuck Maynard torestore North America's population of American chestnut trees, which wasdecimated in the early 1900s by a fungus known as chestnut blight. Afungus, C. parasitica, contributes to the growth of cankers on the trees'trunks; these cankers, in turn, prevent trees from transporting water from their roots to their branches and leaves. To render American chestnuttrees resistant to the blight, Powell and Maynard experimented with altering the genetic makeup of the trees. The resultant genetically engineered trees are called Darling 4 American chestnut trees, and duringthe first 15 weeks after infection with chestnut blight, they grow cankersthat are much smaller than those that grow on American chestnut trees.
Select an answer
(A) NO CHANGE
(B) messed about with
(C) tried some stuff out for
(D) embarked on a journey of discovery regarding
答案：A
解析：A是正确的选项，这两个人试着改变熟的基因，所以应该是进行试验更符合这篇文章的学术性质，其它选项没有表明这个。
上面是小编为您整理的2016年3月21日SAT官方每日一题，是语法选择题，为了让我们更好的适应sat考试，sat官网每天都会发布sat官方每日一题大家抓紧练习吧。
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