Part III Directions: In this section, you’ll hear some passages. At the end of each passage, you'll hear some questions. Both the passage and the questions will be spoken only once. After each question, choose the best answer from the four choices marked A, B, C, and D. Questions 15 to 17 are based on the passages you have just heard. 15 ) A . How to choose a major at a university. B . General information about undergraduate programs in the US. C . How to choose proper courses at a university. D . How to get help from an academic adviser. 16 ) A . Most undergraduate students have chosen their major when entering a university. B . Students are not allowed to change their major at university. C . Wisely chosen courses can help students graduate soon. D . The deadline for choosing a major is the end of the first year at a university. 17 ) A . To help students select their classes. B . To plan proper program for students. C . To direct students to make more progress. D . All of the above.