2017年英语一Text 2真题解析
本篇文章将对2011年英语一的Text2进行一个解析。
本文选自2010年的Scientific American, 文章主要讲述的是日益方便的DNA坚定技术。在文章一开始首先介绍了PTK非常方便获得，接着讲述了DNA鉴定技术中最受欢迎的两种代表：亲子及亲族鉴定。然后文章由通过观察家的观点引出对此技术的质疑：每个人祖先的数目太多以至于基因信息在向下一代传递时会不断丢失部分信息，进而使得信息的不准确性。最后文章引出批评指出由于商业基因数据库可能是不完整的，从而导致了信息偏差。
本篇文章题目设置如下：
26. In paragraphs 1 and 2 , the text shows PTKs
[A] easy availability. [B] flexibility in pricing.
[C] successful promotion. [D] popularity with households.
解析：此题为细节题，考查考生对文章细节信息的理解能力，本题的难点在于无法通过题干中的信息直接锁定在某个段落的具体某句话，需要考生自己提炼出共同的特点。通过All he needs to do is shell out $ 30 for a paternity testing kit (PTK) at his local drugstoreand another $120 to get the results.及they first become available without prescriptions last years这些信息可以判断答案为A。
27. PTK is used to
[A] locate ones birth place. [B] promote genetic research.
[C] identify parent-child kinship. [D] choose children for adoption.
解析：此题为细节题，考查考生对文章细节信息的理解能力。虽然本题没有明确告知考察哪个段落，按照题文同序原则，我们可以猜测该题应该考察文章第三个段落。该题的关键在于通过题干中的use定位至第三段第一句，根据adopted children can use to find their biological relatives and families can use to track down kids put up for adoption.这些信息可知答案为C。
28. Skeptical observers believe that ancestry testing fails to
[A] trace distant ancestors. [B] rebuild reliable bloodlines.
[C] fully use genetic information. [D] achieve the claimed accuracy.
解析：此题为细节题，考查考生对文章细节信息的理解能力。本题比较简单，根据题干信息可以将答案锁定在第5段的There is a kind of false precision being hawked by people claiming they are doing ancestry testing中，不难选出正确选项D。
29. In the last paragraph, a problem commercial genetic testing faces is
[A] disorganized data collection. [B] overlapping database building.
[C] excessive sample comparison. [D] lack of patent evaluation.
解析：此题为细节题，考查考生对文章细节信息的理解能力。本题也比较简单，根据题干信息可以将答案锁定在最后一段Databases used by some companies dont rely ondata collected systematically but rather lump together information from different research projects.，答案为A选项。
30. An appropriate title for the text is most likely to be
[A] Fors and Againsts of DNA Testing [B] DNA Testing and Its Problems
[C] DNA Testing Outside the Lab [D] Lies Behind DNA Testing
解析：主旨大意题，考察文章中心。本题可以巧妙的通过找题干中反复出现的普通表达这一技巧来解题，即：fail to = problem。答案为B选项。
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