Freedom's LandingPaperback - 1996
The alien Catteni value strength and intelligence in their slaves--and Kristin has managed to survive her enslavement while hundreds of other humans have not. But her trial has just begun, for now she finds herself part of a massive experiment. The aliens have discovered a new world, and they have a simple way of finding out if it's habitable: drop hundreds of slaves on the surface and see what happens.
If they survive, colonization can begin. If not, there are always more slaves.