The author seems to suggest that high divorce rate is related to ______.

单项选择题The author wrote this article______.

单项选择题In order to get the discounts in question, the schools or libraries have to______.

单项选择题What would eventually happen if the gap in technology access remains unclosed

单项选择题Before the early 1950's, most historians who studied pre-industrial Europe had______.

单项选择题Le Roy Ladurie is mentioned______.