Once you type the text to be searched on the omnibox, it is replaced by a long URL, e.g. https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=how%20to%20select%20text%20on%20google%20search%2c%20when%20using%20chrome%20for%20ios7%3f
Then, if you want to select some of the previous text, tap and hold will not work.
Is there other alternative?