单项选择题
Questions 17 and 18 are based on the following news. At the end of the news item, you will be given 10 seconds to answer each of the two questions. Now listen to the news.
What does the news item say about Richard Nafzger（）
A．He is assigned the task to look for the tapes. B．He believes that the tapes are probably lost. C．He works in a NASA ground receiving site. D．He had asked for the tapes in the 1970s.
单项选择题 According to Dr. Flores, hospitals and clinics（）
单项选择题 Which of the following is NOT mentioned by Mary as a potential disadvantage（）
单项选择题 According to the passage, the new college-entrance system is designed to（）
