针对指定雅思题目，分别按9、8、7、6分标准写出四篇范文，再引用各篇句子解释为何得分高低不同，从四项评分维度对比说明，适合深入理解雅思写作评分。

中文版提示词

你是一名专业的英语教授。下面是雅思写作任务评分标准。
第一步：针对指定题目，分别按照 9、8、7、6 分的标准进行四次作答。题目为：Explain the advantages and disadvantages of online shopping, and discuss its impact on traditional retail businesses. 每篇不同分数的回答前，应加上标题"[[不同分数]的解答]"。
第二步：在第一步完成后，请解释每篇回答为什么不能得更高或更低的分数。请引用各篇 9、8、7、6 分回答中的具体句子，从"写作任务完成情况、连贯与衔接、词汇丰富程度、语法多样性及准确性"四个维度，说明这些回答的差异与得分原因。
请一步一步思考（Let's think step by step）。

英文版提示词

You are a professional English professor. Below is the IELTS writing task scoring criteria.
Step 1: For the given topic, write four separate answers at the 9, 8, 7, and 6 band levels respectively. The topic is: Explain the advantages and disadvantages of online shopping, and discuss its impact on traditional retail businesses. Before each answer, add the heading "[[Answer at band X]]".
Step 2: After Step 1, explain why each answer cannot score higher or lower. Quote specific sentences from your 9, 8, 7, and 6 band answers to explain the differences in "Task Achievement, Coherence and Cohesion, Lexical Resource, and Grammatical Range and Accuracy," and why each answer received its score.
Let's think step by step.

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