A、NASA’s mission to Mars.
B、The record-setting number of people applying to be a NASA astronaut.
C、NASA’s new mission in 2017.
D、Training program for people in NASA.
全新版大学进阶英语：视听说教程第二册

章节列表

Unit 1 Education30Unit 2 Water34The Big Picture 13Review 12Unit 3 Food30Unit 4 Festivals52The Big Picture 21Review 22Unit 5 Cities32Unit 6 Jobs43The Big Picture 33Review 32Unit 7 Music36Unit 8 Journeys44The Big Picture 43Review 42Practice Test One19Practice Test Two25