For nearly a century, physiologists erroneously believed that a buildup of lactic acid in
muscle tissue was responsible for the soreness that many people experience after
The acid, they claimed, is the waste produced by metabolic activity in
the muscle and reaches “threshold” levels, causing soreness, when the muscle has depleted
its oxygen supply. Researchers have recently discovered, however, that lactic acid is
actually the fuel that powers muscular activity.
Therefore, the cause of muscle soreness
remains unknown. In the argument above, the portions in boldface play which of the
A) The first is an assertion that the author accepts as true; the second is a consideration in
support of that assertion.
b) The first is an assertion that the author accepts as true; the second describes a situation that
the author posits as contrary to that assertion.
c) The first is an assertion that the author argues against; the second is evidence presented as
contrary to the author’s argument.
d) The first is evidence that the author believes is no longer valid; the second is additional
evidence that the author uses to support his main point.
e) The first is a claim that the author believes to be invalid; the second is the author’s main
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