Can't really answer your first two questions, but the following link should bring to light on these:
http://ada.org/prof/ed/testing/dat/demo/sample/dat_ss_question.htm
I remember the actual passages're longer than achiever's. But the heavy content on medical/biological sciences did not affect my overall performance on the reading section. Also, be prepared for the finance topic as appeared on mine.
The passage appearing beneath the question works just like achiever's though, where the whole thing would reset to the first line of the first paragraph each time you hit to the next question.