单项选择题

A．How to save your money.
B．Where to make a phone call.
C．How much phone calls cost.
D．How to make cheaper phone calls.
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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.
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
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