单选题
The study on the military school students indicated that ______.
A、
life in the school was very stressful
B、
disease could be caused by psychological factors
C、
the good students were likely to fall ill
D、
stress often made students unhappy
【正确答案】
B
【答案解析】
第二段科学家们怀疑心理因素可能导致疾病，第三段指出several recent studies showed a connection between stress and illness，以美国一个军事学校为例对该观点进行论证，可以判断选项B正确。
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