课堂讨论和projects优点：
1)学生头脑风暴，相互分享想法，激发思考
2)独立自主学习，提高研究的能力
老师讲课的优点：
1)效率高，可以传授更多知识和信息
2)高中生自己无法学习理论，抽象概念，需要老师讲解
20171104托福独立写作题目：
High school teachers (teachers of students ages 14-18) spend most of class time lecturing (speaking) while the students listen and take notes. Other high school teachers spend most of class time on discussion and projects that students are highly involved in and exchange their ideas. Which of these two approaches do you think is more effective for student learning and why?
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