What is mainly described in the passage?

(单选题)13. （ ） (单选题)12. （ ） (单选题)11. （ ） (单选题)—Could you please tell me where the North Ferry is?—______. (单选题)Which of the following is the best title? (单选题)For which of the following reasons can it be inferred from t (单选题)According to the passage, which of the following can best en (单选题)What is the response of many educators to the use of externa (单选题)What is true about the two groups of researchers mentioned i (单选题)Overall, what is the author’s opinion?