<em>Questions 17 to 20 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation.</em>
A、
Its variety of colors.
B、
Its unusual texture.
C、
The way it is sold.
D、
Its main ingredient.
【正确答案】
D
【答案解析】
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