单项选择题

It can be inferred from the passage that brain size is assumed to ______.

A．be an indicator of cognitive ability
B．vary among individuals within a species
C．be related to food consumption
D．correspond lo levels of activity
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单项选择题
It can be inferred from the statement about mother chimpanzees and their young (lines 21—23) that young chimpanzees have difficulty ______.
A．communicating with their mothers
B．adding quantities
C．making choices
D．opening hard nuts
单项选择题
Scientists concluded from the experiment with chimpanzees and chocolate chips that chimpanzees ______.
A．lack abilities that other primates have
B．prefer to work in pairs or groups
C．exhibit behavior that indicates certain mathematic ability
D．have difficulty selecting when given choices
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