单项选择题

In the past, many doctors ______.

A．never thought of any possible link between stress and illness
B．hardly considered emotional factors when dealing with a patient
C．discovered that the brain and the immune system functioned independently
D．found that diseases were caused by psychological factors
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单项选择题
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
单项选择题
The text mainly supplies information for answering which of the following questions
A．Can the immune system be affected by emotional factors
B．Why can our bodies fight the bacteria and viruses which cause diseases
C．How can the immune system be affected by emotional factors
D．Why can't blood cells in bereaved people's bodies work properly
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