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
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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
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 to levels of activity
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