单项选择题

In the third paragraph, a crow is mentioned as an example to show______.

A．crows are cleverer than chimpanzees
B．crows have a certain amount of intelligence
C．non-primates are as intelligent as primates
D．non-primates are able to use tools

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According to the author, who can benefit from business competition

单项选择题

Why do many scientists think animals are basically sleepwalkers

A．Because animals learn to carry out complex actions.
B．Because animals are trained to carry out complex actions.
C．Because animals carry out complex actions in response to stimuli.
D．Because animals carry out complex actions without awareness.