为了让我们更好的适应SAT考试，SAT考试官网每天都会有SAT官方每日一题，下面是澳际小编为您整理的2017年1月22日SAT题目，是阅读题，让我们一起来看一看这道题目吧。

　　Critical Reading>Select an Answer

　　Four billion years ago, Earth's continents began taking shape. Scientists long held that this process unfolded gradually. It would have taken millions of years for granite, the primary component of the continental crust, to form in the mantle and migrate to the upper crust, they reasoned. But new research suggests that these events may have proceeded at rather a different pace. According to a report published in the journal Nature, the emergence of granite occurred by way of swift, dynamic and possibly catastrophic events lasting from 1,000 to 100,000 years.

　　Geologist Alexander Cruden of the University of Toronto and his colleagues turned to experimental studies—melting rock samples, for example—to explore how granite magma forms and how fast it can move. Their results proved surprising. "In the past we thought that granite magma, which cools and crystallizes to form very large granite intrusions, moved up through kilometers of crust as large, solid blobs at rates of about a meter per year," Cruden says. "But we've found that magma actually has quite low viscosity and is relatively runny. Because it is runny, it is able to channel its way from the mantle and lower crust through fractures and cracks that are as small as one meter thick."

　　According to this model, granite intrusions in Greenland or the Canadian Shield, depending on their size, would have taken only thousands of years to form, which is extraordinarily fast from a geological point of view, Cruden notes.

　　The first paragraph of this passage serves primarily to __________

　　(A) introduce two competing explanations of a natural phenomenon.

　　(B) establish the validity of evidence supporting a new scientific theory.

　　(C) compare and contrast two perspectives on a recent discovery.

　　(D) present a detailed timeline of advances in a field of study.

　　澳际培训提醒各位参加准备sat考试的同学，仔细看完以上的sat考试官网题目，然后再看下面的SAT题目答案更有效哦。

　　答案：A

　　解析：

　　Choice A is the best answer. The first paragraphpresents two different explanations for thormation of Earth's continents. The idea "longheld" by scientists is that the formation "unfoldedgradually" over "millions of years." The other idea, sparked by recent research, is that thormation occurred in a relatively "swift" period of "1,000 to 100,000 years."

　　以上就是澳际小编为根据SAT考试官网最新信息，为您整理的2017年1月22日SAT题目，目的是为了让我们更好的适应SAT考试，如果在备考过程中遇到任何问题，欢迎随时咨询澳际培训，为您提供最专业、最全面的解答。

　　SAT金牌一对一

　　想要快速提分，一对一最适合你

　　1一对一会根据你的实际情况制定计划

　　2每天有专职顾问记录你全天的学习进度

　　3授课的时间、地点、形式都非常灵活

　　4一对一授课的吸收率是大班课的5倍

　　5教学更具交流性，课堂上可随时反馈

　　6每学科教师辅导+专门学习顾问+助教

　　数据证明一对一授课的吸收率，是大班课的5倍!

　　澳际标准化SAT课程教学体系——平均教龄5年以澳际师研发，历经8年SAT考试实战验证，数据证明一对一授课的吸收率，一对一授课效率是小班授课的2~3倍，是大班课的5倍，最大限度保证学习效果，家长要做的就是放心把孩子交给澳际。

　　一对一授课能为你做什么?

　　一对一的授课非常适合想要快速提分的学生，它的吸收率比班课更高，排课更为灵活，这意味着用更短的时间达成目标。尤其是想要冲击高分的学生，很难在约定俗成的班课上有针对性地弥补短板。老师在一对一的形式下，也能更好地照顾到学生的需求。以作文批改为例，如果是班课就难以实现，因为数量太多了，费时费力。但在澳际的一对一授课中，每位学生都能获得经老师2次修改成文的文章4-6篇。想在25分钟内流畅地写出500词以上的文章，没有这个打磨的过程，谈何容易。

　　自由安排上课时间，网络课堂克服地理限制

　　SAT一对一课程

　　课程介绍：SAT资深教师针对考点重点点拨，从基础到强化全面提高

　　课程教材：SAT官方指南、SAT历年考试真题集、澳际名师内部讲义

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