单项选择题

According to the conversation, what is one problem with arm exericse

A．They don’t get rid of flabby arms.
B．They can damage arm muscles.
C．They aren’t acceptable to most people.
D．They can raise one’s blood pressure.
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单项选择题
According to the passage, what happens to the behavior of rodents when they are artificially crowded together
A．Their allelomimetic behavior increases.
B．Continuous cooperation between them is maintained.
C．They become aggressive and attack each other.
D．They show little allelomimetic behavior.
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
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