【题目】What caused the difference in the price?
A. The color.B. The size.C. The material.
在线课程【答案】C
【解析】
M: Excuse me, can you tell me why the white shirt costs $300, while the black one on the left is only half the price?
W: Well, that is because the white one is made of good silk.
本题为听力题，解析略。