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

According to the second paragraph, crows are poor subjects for field research for all the following reasons EXCEPT ______.

A．they can successfully avoid observers
B．they are hard to distinguish from one another
C．they can be quite aggressive
D．they are difficult to catch

单项选择题

The locations of even the cemeteries indicate that ______.

A．middle class suburban areas are always, preferred
B．efforts have been made to make every visit convenient
C．people desire to put problems out of their sight
D．most people don't like the quietness of rural settings