The aim of giving these articles is not to make you an expert in those specific subjects. It is to make you get used to with the different styles of writings based on different topics and get you comfortable with various subjects. IN CAT and other exams you will not leave an RC because you will be very used to with those articles if you read the following types of articles. Try reading at-least 14 articles per week.
http://www.the-american-interest.com/article.cfm?piece=1507
http://www.resetdoc.org/story/00000022295
http://www.sciencedaily.com/releases/2013/10/131024143307.htm
http://www.sciencedaily.com/releases/2013/10/131024143140.htm
http://www.sciencedaily.com/releases/2013/10/131023101349.htm
http://www.dissentmagazine.org/blog/syria-what-ought-to-be-done
http://www.sciencedaily.com/releases/2013/10/131024143309.htm
http://www.sciencedaily.com/releases/2013/10/131024102243.htm
http://www.buzzle.com/editorials/2-19-2004-50729.asp
http://www.buzzle.com/articles/morals-vs-ethics.html
http://www.buzzle.com/articles/idealism-vs-realism.html
http://www.religion-online.org/showarticle.asp?title=71
http://www.newscientist.com/article/mg22029401.100-babies-know-good-from-evil--is-this-morality.html
http://www.religion-online.org/showarticle.asp?title=1236
http://blogs.scientificamerican.com/brainwaves/2013/10/28/are-we-too-close-to-making-gattaca-a-reality/
http://www.religion-online.org/showarticle.asp?title=2443
http://www.religion-online.org/showarticle.asp?title=45
http://www.religion-online.org/showarticle.asp?title=1819
http://www.religion-online.org/showarticle.asp?title=468
http://www.the-american-interest.com/article.cfm?piece=1507
http://www.resetdoc.org/story/00000022295
http://www.sciencedaily.com/releases/2013/10/131024143307.htm
http://www.sciencedaily.com/releases/2013/10/131024143140.htm
http://www.sciencedaily.com/releases/2013/10/131023101349.htm
http://www.dissentmagazine.org/blog/syria-what-ought-to-be-done
http://www.sciencedaily.com/releases/2013/10/131024143309.htm
http://www.sciencedaily.com/releases/2013/10/131024102243.htm
http://www.buzzle.com/editorials/2-19-2004-50729.asp
http://www.buzzle.com/articles/morals-vs-ethics.html
http://www.buzzle.com/articles/idealism-vs-realism.html
http://www.religion-online.org/showarticle.asp?title=71
http://www.newscientist.com/article/mg22029401.100-babies-know-good-from-evil--is-this-morality.html
http://www.religion-online.org/showarticle.asp?title=1236
http://blogs.scientificamerican.com/brainwaves/2013/10/28/are-we-too-close-to-making-gattaca-a-reality/
http://www.religion-online.org/showarticle.asp?title=2443
http://www.religion-online.org/showarticle.asp?title=45
http://www.religion-online.org/showarticle.asp?title=1819
http://www.religion-online.org/showarticle.asp?title=468