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答案：D
解析：
From the circle graph, 30 % of the students surveyed chose Action and 14 % chose Drama as their favorite movie genre. Hence 40 students is equal to 30 % minus 14 % = 16 % of the total number of students surveyed. Let N be the number of students surveyed; then the last statement can be written symbolically as 0.16 times N = 40. Solving for N gives N = 250. Therefore, the total number of students surveyed was 250.
