Since 1971 the Canadian government has adopted policy of ______, recognizing that cultural pluralism with- in a bilingual framework is the essence of the Canadian identity.

单项选择题Chinese poetry and philosophy have exerted great influence over ______.

单项选择题In English Civil War, also called the Puritan Revolution, a famous general _____ defeated the king at Naseby in 1645.

单项选择题In the United Kingdom, police officers are not allowed to join _________ or to go on strike.

单项选择题The direct reason for specialization is ______.

单项选择题The author writes the development of geology to demonstrate ______.