听第 10 段材料,回答第 17 至 20 题。 17. What is the speaker? A . A freshman in Deep Springs College. B . An editor in the college. C . A professor in the college. 18 . What is L . L.Nunn's intention to found Deep Springs College? A . Developing farming in desert. B . Carrying out a longterm project. C . Getting youths ready to serve humans. 19 . How many courses does the speaker attend this semester? A . Three. B . Four. C . Five. 20 . Why did so many professors visit Deep Springs? A . They wanted to apply for the position of some courses. B . They could give presentations of their research. C . They wanted to interview the Student Body.