单项选择题

According to the third paragraph, which of the following is true about crows

A．They seldom live in any one place or very long.
B．They thrive in a wide variety of environments.
C．They have marked preferences for certain kinds of foods.
D．They use up the resources in one area before moving to another.

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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.

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.