单项选择题

Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
According to the passage, all the following are the uses of the copper EXCEPT ______.

A．killing any pathogens that settle on it
B．reducing the risk of cross contamination
C．placing raw food
D．preventing the spread of infection

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单项选择题

单项选择题

Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. According to the passage, all the following are the uses of the copper EXCEPT ______. 您的浏览器不支持 audio 元素。