单选题 Please explain in your own words why stress can cause a vicious academic cycle. ( This question is based on Passage 4)
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【正确答案】 1、正确答案：Stress affects students’immune system，which makes them easily get ill and miss classes，which leads to failure in test．    
【答案解析】解析：事实细节题。根据题干要求“a vicious academic cycle”，可以将范围锁定在文章第三段，概括该段内容即可。