1. School of Foreign Languages, University of Electronic Science and Technology of China, Chengdu 610054, China
2. Department of Teacher Education, Norwegian University of Science and Technology, 7491 Trondheim, Norway
3. Department of English, Chabahar Maritime University, Chabahar 99717-56499, Iran
4. Department of English, American, and Celtic Studies, University of Bonn, 53115 Bonn, Germany