单项选择题

A．When hunting for food.
B．When sleeping.
C．When being attacked.
D．When communicating with their cousins.
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单项选择题
It is helpful for managers to talk with their employees to learn the workplace negativity problems.
A．Y
B．N
C．NG
单项选择题
According to the passage, anthropologists believe that human beings ________.
A．have some traits in common
B．are born with diverse cultures
C．are born without a fixed nature
D．change their characters as they grow up
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