body: //div[contains(@class, 'single-post-thumbnail')] | //*[@itemprop="articleBody"]

test_url: http://aitnews.com/2016/04/23/%D8%A7%D9%84%D9%80-fbi-%D9%8A%D8%AE%D8%AA%D8%B1%D9%82-%D9%87%D8%A7%D8%AA%D9%81-%D8%A2%D9%8A%D9%81%D9%88%D9%86-%D8%A2%D8%AE%D8%B1-%D8%AF%D9%88%D9%86-%D9%85%D8%B3%D8%A7%D8%B9%D8%AF%D8%A9-%D8%A2%D8%A8/