单项选择题

Some scientists believe that there is no evidence that cholestrol in food is directly linked to ______.

A．blood disease
B．heart disease
C．infectious disease
D．mental disorder
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单项选择题
High cholesterol foods include ______.
A．eggs, meats and milk products
B．potatoes, green vegetables and tomatoes
C．corn, wheat and beef
D．sugar, rice and butter
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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