问题
单项选择题
A source of stress NOT specifically mentioned in this passage is ______
A．educational activity
B．physical activity
C．mental activity
D．emotional activity
答案
参考答案：A
解析：[分析] 是非题型。 由文章第二句(It comes from mental or emotional activity as well as physical activity．)可知没有明确提及的压力来源只有选项A．educational activity。