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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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
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