SAT官方每日一题：2012年1月9日

　　为了方便广大考生更好的复习，和谐英语网综合整理了SAT官方每日一题，以供各位考生考试复习参考,希望对考生复习有所帮助。愿大家都能取得好成绩，更多有关留学考试的资讯与辅导资料敬请关注和谐英语网留学考试频道。

　　2012年01月09日

　　考试类型:Writing > Improving Sentences

　　Part of the following sentence is underlined; beneath the sentence are five ways of phrasing the underlined material. Select the option that produces the best sentence. If you think the original phrasing produces a better sentence than any of the alternatives, select choice A. 

　　Although biologists have made tremendous progress in mapping the human genome, the genetic roots of most common diseases remained largely elusive.