单项选择题

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

A．Business associates,
B．Boss and secretary.
C．Teacher and student.
D．Good friends.

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填空题

According to the WHO, increases in malaria, water-borne disease and malnutrition could threaten ______.

问答题

The man speaks ______ (好像他以前到过那儿似的).

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