单项选择题

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

A．At the airport.
B．In the student center.
C．At the travel agency.
D．In a restaurant.
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单项选择题
A．They run about and hunt for food.B．They collect but do not produce their own food.C．They do not rely on clear division of labor.D．They lead a completely agricultural way of life.
A．They run about and hunt for food.
B．They collect but do not produce their own food.
C．They do not rely on clear division of labor.
D．They lead a completely agricultural way of life.
填空题
The ______ you are exposed to appliances with a strong field, the greater the harm done by electromagnetic radiation is.
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