hard · GMAT Verbal
Conservationist: Reintroducing beavers is the cheapest way to cut downstream flooding, since their dams slow runoff. True, **a beaver dam can occasionally fail and release a damaging surge**, but engineered flood barriers fail too, at far greater cost. So **the dam-failure risk is no reason to favor engineered barriers over beavers.**
In the argument, the two boldface portions play which roles?
- The first is an objection the argument rebuts; the second is the conclusion that objection fails to undermine.
- The first is the main conclusion; the second is a premise supporting it.
- The first states the argument's central principle; the second applies that principle to a case.
- The first is evidence for the conclusion; the second restates that evidence in stronger terms.
- Both are intermediate conclusions used to support a further, unstated claim.
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