单项选择题

What conclusion can be logically drawn from the selection

A．Only poorly educated people seek the advice of quacks.
B．Quacks are motivated by the desire to help mankind.
C．A person's brain can not control the body's pain-tolerance level.
D．The human brain is a powerful and mysterious organ.
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单项选择题
All of the following are masons why quacks continue to do business Except that ______.
A．people who are in pain will often pay any amount of money for the promise of relief
B．the average person is not trained to evaluate medical claims and diagnoses
C．although their remedies may not cure a disease, quacks nevertheless do not harm their patients
D．quacks convince patients that they can help them
单项选择题
The effect of becoming depressed about an illness is ______.
A．a slowing of the body's curative processes
B．a collapse of the autonomic nervous system
C．an emotional state that ranges from extremes of depression to happiness
D．an evident and gradual decrease in the physical symptoms of the disease
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