单项选择题

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

A．Customs officer and traveler.
B．Shop assistant and customer.
C．Repairman and customer.
D．Postman and customer.

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Fever is a ______ to infection, and no major problems generally come from fever itself.

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If your infant ______ has a temperature of 100.2 degrees or more, you should call your physician.

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