单项选择题

According to the passage, people could reduce the chance of suffering heart attack by ______.

A．eating less foods with a lot of cholesterol
B．eating less of low cholesterol foods
C．eating a lot of high cholesterol foods
D．eating drugs
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单项选择题
According to the passage the primary function of allelomimetic behavior in bird is to ______.
A．defend nests against predators
B．look at each other
C．locate prey
D．warn against predators
单项选择题
Which of the following places is the most likely setting for allelomimetic behavior
A．A lake.
B．A cave.
C．An underground tunnel.
D．A thick forest.
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