考场机经 test76
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Manatees are large marine mammals that inhabit the coastal waters of southern Florida and feed on the vegetation that grows in shallow waters. They frequently gather in the vicinity of power stations that release heated water into the sea. Since the warmer water supports abundant vegetation, some biologists have hypothesized that manatees gather in these areas because they are attracted to this convenient source of food.
Which of the following, if true, most seriously undermines the hypothesis?
A
When a power station near which manatees usually gather is shutdown for even a few hours, manatees move elsewhere.
B
Other marine animals that feed on vegetation also congregate in large numbers in the vicinity of power stations.
C
All of the species of vegetation that grow near the power stations also grow elsewhere in the coastal waters of southern Florida, though not nearly as abundantly.
D
Even more manatees than usual gather near power stations during the winter months, when vegetation growth away from power stations slows.
E
Manatees also tend to gather in waters where high levels of nutrients support especially abundant vegetation.
Select one answer choice.
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1.未作答
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1.A
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