单项选择题


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

A．Someone hired by the auto club.
B．He repaired it himself.
C．A private mechanic he phoned.
D．A passing police patrol car.
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According to the survey made by Jones and her colleagues, new diseases arise as a result of dramatic increases in population, international trade and travel, and ________.
填空题
distinguish
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