TPO (TOEFL Practice Online) 是美国教育考试服务中心(Educational Testing Service，简称ETS)专为参加TOFEL TPO 口语第12套Question 6答题技巧及模版：
Question：Using the points and examples from the lecture, explain how substitute goods and complement goods influence demand for a particular product.
1、题目关键词：examples, influence
2、答题要领：
(1)explain the concepts of substitute goods and complement goods.
(2)use specific examples mentioned in the lecture to explain the influence.
3、听力材料要点：
(1)Substitute goods: similar enough to be interchangeable. Increase the price of one means increase the demand of the other. Butter and margarine(人造黄油).
(2)Complement goods: must be used together, completement each other. Their prices go up and down together. CD and CD player.
4、模板：
(1)In the listening material, the professor introduces two concepts. The first is ... ; The second is ...
(2)The example used to explain the first one is ...
(3)The example used to explain the second one is ...【】
网老师提醒：用TPO作为托福备考教材和练习工具，已经成为全球考生必选。由于TPO试题的权威性和实用性，SmartStudy（网）组织了权威师资对TPO进行了逐套逐项逐题的详细讲读，包括题目理解，答题思路，解题步骤，答案分析和难点重点针对解析，覆盖最全面的做题逻辑，输出细致贴心的答题辅导，并以精美的课件清晰呈现。相信SmartStudy（网）托福版块的“
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