Chen Xu Cobb's real question is true. According to relevant public information, education in Chen Xu is specifically aimed at taking exams. The examination questions come from candidates who have passed the examination in various schools and are collected by doctoral students, doctoral tutors or insiders. Authority and reliability. Chen Xu Cobb. Com provides exam questions of Dr. Cobo's English, specialized courses and review materials of more than 400 universities across the country.