It may not be obvious, but hearing two languages regularly during pregnancy puts infants in the road to bilingualism 【M1】______

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问题     It may not be obvious, but hearing two languages regularly during pregnancy puts infants in the road to bilingualism  【M1】________
    by birth. According to new findings in Psychological Science, a journal of the Association for Psychological Science, infants born to bilingual mothers (who spoke both languages regularly during pregnancy) exhibit different language preferences than infants born to mothers speak only one language.                              【M2】________
    Psychological scientists Krista Byers-Heinlein and Janet F. Werker from the University of British Columbia along with Tracey Burns of the Organization for Economic Co-operation and Development in France wanted to investigate language
    preference and discrimination in newborns. Two group of                                                               【M3】________
    newborns were tested in these experiments: English monolinguals (whose mothers spoke only English during pregnancy) and Tagalog-English bilinguals (whose mothers spoke both Tagalog,
    language spoken in the Philippines, and English regularly                                                             【M4】________
    during pregnancy). The researchers employed a method
    knowing as "high-amplitude sucking-preference procedure"                                                              【M5】________
    to study the infants’ language preferences. This method
    capitalizes on the newborns’ sucking reflex-increasing                                                                【M6】________
    sucking indicates interest in a stimulus. In the first experiment,
    infants heard 10 minutes of speech, with every minute
    alternative between English and Tagalog.                                                                              【M7】________
    Results showed that English monolingual infants were more interested in English than Tagalog—they exhibited
    increased sucking behavior when they heard English than                                                               【M8】________
    they heard Tagalog being spoken. However, bilingual infants had an equal preference by both English and Tagalog       【M9】________
    These results suggest that prenatal bilingual exposure may
    affect infants’ language preferences, prepare bilingual infants                                                       【M10】________
    to listen to and learn about both of their native languages.
【M8】

选项

答案English than∧→when

解析 由than可知,此处比较“他们听到英语时”和“他们听到塔加洛语”时的吮吸行为,而than之前的时间状语由when引导,之后的时间状语也应该由when引导。故than之后应加上when。
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