单项选择题

In refuting the alarmists, the author advances his argument by first challenging ______.

A．the source and amount of their data
B．the targets of their observation
C．the system of measurement
D．their definition of violence
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单项选择题
What does the author think of the debate concerning the relationship between the media and violence
A．More studies should be conducted before conclusions are drawn.
B．It should come to an end since the matter has now been settled.
C．The past studies in this field have proved to be misleading.
D．He more than agrees with the views held by the alarmists.
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