Like is used to introduce similarity between two items or persons. This is an accepted usage in Sentence Correction on the GMAT. In other words, like cannot be used to introduce examples or a subset of a category, which should be used following such as.
Correct: I enjoy playing musical instruments such as piano and violin.
Wrong: I enjoy playing musical instruments like piano and violin.
In sum, on the GMAT, use like before a noun or pronoun when emphasizing similar characteristics between two persons, groups or things. Use such as before a noun or phrase when introducing examples.
Source: http://asia.vault.com/nr/newsmain.jsp?nr_page=3&ch_id=421&article_id=31552030&cat_id=3551
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