（D） The stratum from which the samples came has been below the surface of the Earth ever since the Earth came into existence.
（E） The temperature at the bottom of the holes drilled was not significantly hotter than that of the hottest spots on the Earth's surface.
14. For 20 years all applicants for jobs as technicians at EquipCorp were required to demonstrate that they could operate and repair the machinery that was central to EquipCorp's
manufacturing business. Now， however，that particular machinery is obsolete， and very different machinery fills the central role. Therefore， the old requirement is no longer a useful method for evaluating whether applicants for jobs as technicians at EquipCorp have the skills necessary for the job.
Which of the following， if true， most strengthens the argument？
（A） The machinery that is now obsolete was used by a large number of manufacturing companies before it became obsolete. （B） Among the people already holding jobs as tech-nicians at Equip Corp， those who are most skillful at operating the new machinery had been some of the least skillful at operating the old machinery
（C） Most people applying for jobs as technicians today have much broader skills than did people applying for jobs as technicians 20 years ago.
（D） The skills required to operate and repair the obsolete machinery are useful in operating and maintaining many other types of machinery at EquipCorp that are not obsolete.（E） Much
of the machinery that EquipCorp now uses in manufacturing is very likely to become obsolete within the next 20 years.
参考答案：CBDDBEEBCADB参考答案：ACBBEEAAECDACB
新G数学复习要点:Sum of Arithmetic Progression
俗话说：“工欲善其事必先利其器”。很多参加了新版GRE考试的同学都觉得数学有点难度，相信这其中的原因还是由于考生在新版gre数学复习时没有把基础打牢。如果新版gre数学基本考点都没有复习到，如何能拿到分数呢?所以说，想要新版gre数学考好，复习的时候一定要把基本概念和重要考点都弄扎实。 所以，从今天起，针对新版gre数学复习，小编每天给考生整理一个重要考点，这些概念在考试中一定会考到的。希望考生能再接再厉，取得一个好成绩，突破新版gre数学难的困境。 新版gre数学复习重要考点：Sum of Arithmetic Progression
The sum of n-numbers of an arithmetic progression is given by
S=nx*dn(n-1)/2
where x is the first number and d is the constant increment. example:
sum of first 10 positive odd numbers:10*1+2*10*9/2=10+90=100 sum of first 10 multiples of 7 starting at 7: 10*7+7*10*9/2=70+315=385 remember:
For a descending AP the constant difference is negative.
很多新版gre数学复习考点都是高中时候学到的知识点，考生不要过于紧张，把基本概念弄明白，再记住一些新版gre数学必备的词汇，那么相信新版gre数学应该没有问题。
