单项选择题


A．percentage
B．plenty
C．part
D．share
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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
Which of the following is NOT discussed as an ability animals are thought to have
A．Selecting among choices.
B．Anticipating events to come.
C．Remembering past experiences.
D．Communicating emotions.
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