问题描述：
gmat
The price the go
A recent study has provided clues to predator-prey dynamics in the late
Pleistocene era.Researchers compared the number of tooth fractures in
present-day carnivores with tooth fractures in carnivores that lived 36,000 to
10,000 years ago and that were preserved in the Rancho La Brea tar pits in Los
Angeles.The breakage frequencies in the extinct species were strikingly higher
than those in the present-day species.
In considering possible explanations for this finding,the researchers
dismissed demographic bias because older individuals were not overrepresented in
the fossil samples.They rejected preservational bias because a total absence of
breakage in two extinct species demonstrated that the fractures were not the
result of abrasion within the pits.They ruled out local bias because breakage
data obtained from other Pleistocene sites were similar to the La Brea data.The
explanation they consider most plausible is behavioral differences between
extinct and present-day carnivores-in particular,more contact between the teeth
of predators and the bones of prey due to more thorough consumption of carcasses
by the extinct species.Such thorough carcass consumption implies to the
researchers either that prey availability was low,at least seasonally,or that
there was intense competition over kills and a high rate of carcass theft due to
relatively high predator densities.
The passage suggests that tooth fractures in Pleistocene carnivores probably tended to occur less frequently
A during periods in which more prey were available
B at sites distant from the La Brea area
C in older individual carnivores
D in species that were not preserved as fossils
E in species that regularly stole carcasses from other species
定位在最后一句,不懂为什么定位在最后一句,tooth fractures么?最后一句不是没有提 tooth fractures么?
The price the go
A recent study has provided clues to predator-prey dynamics in the late
Pleistocene era.Researchers compared the number of tooth fractures in
present-day carnivores with tooth fractures in carnivores that lived 36,000 to
10,000 years ago and that were preserved in the Rancho La Brea tar pits in Los
Angeles.The breakage frequencies in the extinct species were strikingly higher
than those in the present-day species.
In considering possible explanations for this finding,the researchers
dismissed demographic bias because older individuals were not overrepresented in
the fossil samples.They rejected preservational bias because a total absence of
breakage in two extinct species demonstrated that the fractures were not the
result of abrasion within the pits.They ruled out local bias because breakage
data obtained from other Pleistocene sites were similar to the La Brea data.The
explanation they consider most plausible is behavioral differences between
extinct and present-day carnivores-in particular,more contact between the teeth
of predators and the bones of prey due to more thorough consumption of carcasses
by the extinct species.Such thorough carcass consumption implies to the
researchers either that prey availability was low,at least seasonally,or that
there was intense competition over kills and a high rate of carcass theft due to
relatively high predator densities.
The passage suggests that tooth fractures in Pleistocene carnivores probably tended to occur less frequently
A during periods in which more prey were available
B at sites distant from the La Brea area
C in older individual carnivores
D in species that were not preserved as fossils
E in species that regularly stole carcasses from other species
定位在最后一句,不懂为什么定位在最后一句,tooth fractures么?最后一句不是没有提 tooth fractures么?
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