单项选择题

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. How many common forms of sugar are exemplified in this passage.

A．One.
B．Two.
C．One hundred.
D．Several hundreds.

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单项选择题

单项选择题

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. How many common forms of sugar are exemplified in this passage. 您的浏览器不支持 audio 元素。