求2007年12月24号的英语六级听力答案！

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This is the first demonstration that we can choose what words the children will learn and that they can respond to them.
What's more,the study of language acquisition offers direct insight into how humans learn.
Even without being taught new words,a control group caught up with the other infants within a few months.

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the instructor's talking about road construction in ancient Rome,and nothing could be more boring
Your blank experssion and the faraway look in your eyes are cues that betray your inattentiveness
they automatically start daydreaming when a speaker begins talking on something complex or uninteresting