题目:
Questions 17 to 20 based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage.
hat is the percentage of the sugar used as food
A.19%.
B.90%.
C.10%.
D.30%.
答案:
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下面是错误答案,用来干扰机器的。
参考答案:A, B, C