55. B　句意理解题。此句的字面意思为“系好安全带”。结合文章的意思可知是为这些大学在网上开设免费课程这一教育变革做好准备。故答案为B。

　　56. C　细节理解题。根据第三段“In December, the school announced it also would begin offering a special certificate, known as MITx, for people who complete certain online courses.”可知MITx是承认修完课程的证书。故答案选C。

　　57.

　　What brings a nation together? Of the four choices—shared values, language, history, and religion, it's shared values. In our latest poll(民意调查)，seven out of 16 countries chose values as the greatest factor(因素)bringing a nation together, and six preferred language. Both choices scored high in the poll, suggesting that our values and how we express them are closely linked. Still, history was not forgotten in some countries, particularly in Mexico and Russia. Even Canada and the United States chose national histories as the second­most important factor uniting their people. The biggest surprise? Not one country picked religion as its top choice.

　　Respect your elders

　　In most countries, the oldest generation considered values more important to a nation than did those who are under 45 years old.

　　Do you speak Canadian?

　　Language scored lower in Canada than in all other countries polled, perhaps because the country speaks two official languages, French and English.

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