单项选择题

According to the first paragraph, what evidence is there that crows have interested people for a long time

A．The large number of stories about crows.
B．The frequency with which crows are sighted.
C．The amount of research that has been conducted on crows.
D．The ease with which crows are identified.
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单项选择题
In the last paragraph community based forms of treatment is used ______.
A．in contrast to treatment in specialized institutions
B．to show how efficient it is for mental illness and other diseases
C．to show how futile specialized treatment can be
D．as a synonym to treatment in specialized institutions
单项选择题
The author makes the observation that people build the formal system to deal with social problems because they ______.
A．believe that specialized work should be put into the specialists' hands
B．are afraid that similar problems may happen to them one day
C．hope that their personal lives and work will not be disrupted
D．have to work and have no time to take care of the patients
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