课堂讨论是师生共同构建的一种教学行为,其主要目的是活跃课堂气氛,增加学生讲英语的机会,增强学生讲英语的自信心,从而提高其运用英语进行交际的准确程度和流利程度。有效的课堂讨论活动能调动学生的学习积极性,激发其认知需求,进 Class discussion is a kind of teaching behavior jointly constructed by teachers and students. Its main purpose is to stimulate the classroom atmosphere, increase students ’opportunities to speak English, and enhance students’ self-confidence in speaking English so as to enhance their accuracy and fluency in using English. Effective classroom discussion activities can motivate students to learn and stimulate their cognitive needs.