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【单选题】

Questions 15-18 are based on the following dialogue: Approximately how many human commands have some dolphins learnedA．Five.

B．Fifteen.
C．Fifty.
D．Five hundreD、
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根据网考网移动考试中心的统计，该试题：

9%的考友选择了A选项

18%的考友选择了B选项

59%的考友选择了C选项

14%的考友选择了D选项

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