单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Husband and wife.
B．Teacher and student.
C．Policeman and driver.
D．Mother and son.

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单项选择题

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The FDA banned the use of antibiotic from food-producing animals because public health experts were concerned about ______.

Questions 11 to 18 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。