The researchers then tested samples from ten children, aged between three and five, which showed that females had up to 30 percent more of the Foxp2 protein than males, in a brain area key to language in humans.

　　“Based on our observations, we assume higher levels of Foxp2 in girls and higher levels of Foxp2 in male rats is an indication that Foxp2 protein levels are associated with the more communicative sex，” said Prof McCarthy.

　　“Our results imply Foxp2 as a component (成分)of the neurobiological basis of sex differences in vocal communication in mammals.”

　　1．From the second paragraph, we can learn that ________.

　　A．women always speak more words than men

　　B．men and male rats have low levels of language protein

　　C．McCarthy isn't the first to find females more talkative

　　D．women and male rats have similar levels of Foxp2

　　2．The underlined phrase “fussed over” in the third paragraph probably means ________.

　　A．related to B．paid attention to

　　C．put pressure on

　　D．counted on

　　3．The researchers carried out the experiments on rats in order to ________.

　　A．test which part of the brain is key to language in rats and humans

　　B．prove the levels of Foxp2 protein in humans and rats are different

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