Researchers in Canada studied 36 babies from English-speaking families．Twelve of the babies were 4 months old,12 were 6 months old, and the rest were 8 months old．Each baby sat on his or her mother's lap and watched video clips(电影片断) of a woman talking．The woman was fluent in both English and French．In some clips, she read from a storybook in English．In other clips, she read in French．In all of the videos there was no sound．

　　．What is mainly discussed in the passage ?

　　A．Language teaching．

　　D．Parents and language teaching

　　64．What do the underlined word in the second paragraph refer to ?

　　B． C．．W A．ll the babies in the study are of the same age．

　　B．he babies could hear the woman's voice while watching the videos．

　　C．he stories the woman read were written in either French or German．

　　．Why did the 8-month-old pay no attention when the language was changed ?

　　A．They had lost the ability to distinguish different languages．

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