In communication one may shift from formal English to informal English or from standard English to non-standard English. This is known as ______.

单项选择题The author of Sister Carrie is ______.

单项选择题What impressed the author most when he went to watch the lions in the Gir Forest

单项选择题Why are the lions in the Git Forest especially vulnerable to disease

单项选择题Which of the following is NOT among the reasons that India is creating a secondary sanctuary for the Asiatic lions

单项选择题The author of this passage seems to imply that Victorian novels ______.