Step1：先泛听一遍了解大意，并回答以下问题

1. According to the program, how are American citizens living abroad able to participate in presidential primaries and caucuses?(from News 2)
2. According to the report, why are more young Americans engaged in this year's presidential race? (from News3)

Step2：请听写下面空格部分。
Immigration is my biggest issue, because_____3____. (大约在50秒左右)

They show up in force for rallys and speeches, young faces full of enthusiasm. Political strategists call them "millennial voters," an almost 50 million member group of Americans ages 18-29. _____4_____ (7分10秒出现，大家仔细听吧)