1) The document is an excerpt from the novel Twilight by Stephenie Meyer. It describes a day from the perspective of Edward Cullen as he listens to the thoughts of students at his high school.
2) Edward tries to tune out most thoughts but can't ignore those of his family - including Jasper who is struggling with his thirst after two weeks without hunting.
3) A nearby human girl's scent triggers both Edward and Jasper's thirst. Jasper imagines attacking her, though Alice insists he would not. Edward believes Jasper is taking unnecessary risks by pushing himself.