单项选择题

What is the main topic of the passage

A．The ways in which crows differ from other common birds.
B．The myths and legends about crows.
C．The characteristics that make crows difficult to study.
D．The existing methods for investigating crow behavior.

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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

单项选择题

Which of the following statements is supported by the passage

A．Crows have relatively long lives.
B．Crows have keen vision.
C．Crows are usually solitary.
D．Crows are very intelligent.