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

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单项选择题

Which of the following is NOT TRUE according to the passage

A．Unhappiness may cause disease.
B．Drinking alcohol may cause damage to the immune system.
C．too much sorrow is harmful to the immune system.
D．Psychological stress leads naturally to the damage of the immune system.

单项选择题

The immune system ______.

A．used to be unconnected with the brain
B．causes a lot of stress to people
C．can be affected by emotional factors
D．functions independently