单选题
A source of stress NOT specifically mentioned in this passage is ______
A、
educational activity
B、
physical activity
C、
mental activity
D、
emotional activity
【正确答案】
A
【答案解析】
[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。
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