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, the Ｅ.coli infections can be prevented by ______.

A．personal hygiene
B．washing hands
C．careful food preparation
D．copper

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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, the Ｅ.coli infections can be prevented by ______. 您的浏览器不支持 audio 元素。