单项选择题

Before a baby babbles his first "Ma" or "Papa", ______.

A．he must be exposed to the language
B．his mind must have some input of sounds and words
C．he learns a lot of utterances
D．his mind is busy sorting out the sounds and shapes of words

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热门试题

单项选择题

The view that animals have consciousness may not be convincing to all because______.

A．there is not sufficient evident to prove it
B．there is not rigorous evidence to prove it
C．there is not scientific evidence to prove it
D．there is not direct evidence to prove it

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.