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GRE阅读文章：Sea Cow

2020-07-08 08:15:57来源：网络

　　为了帮助大家高效备考GRE，新东方在线GRE频道为大家带来GRE阅读文章：Sea Cow，希望对大家GRE备考有所帮助。更多精彩尽请关注新东方在线GRE频道!

　　Sea Cow

　　The dis appearance of Steller&aposs sea cow from the Bering and Copper is lands by 1768 has long been blamed on intensive hunting. But its dis appearance took only 28 years from the time Steller first described the species, a remarkably short time for hunting alone to depopulate the is lands, especially given the large populations initially reported. However, by 1750, huntershad also targeted nearby sea otter populations . Fewer otters would have allowed s ea urchin populations on which the otterspreyed to expand and the urchins &apos grazing pressure on kelp forests to increase. Sea cows were totally dependent on kelp for food, and within a decade of the onset of otter hunting Steller noted that the is lands&apos sea cows appeared malnourished.

　　1. Which of the following can be inferred from the pas s age about kelp forests in the Bering and Copper is lands between 1750 and 1768?

　　A. They were reduced significantly.

　　B. They disappeared entirely from the region.

　　C. They were the primary food source for sea otters .

　　D. They were harvested in record numbers by humans

　　E. They increased pressure on sea urchin populations.

　　2. According to the pas s age, it is likely that during the m id-1700s, s ea urchin populations near the Bering and Copper is lands

　　A. were diminished by sea cow predation

　　B. experienced substantial increases

　　C. migrated to waters with more plentiful food supplies

　　D. were reduced by the pressures of hunting

　　E. appeared to be malnourished

　　答案：AB

　　以上就是关于“GRE阅读文章：Sea Cow”的内容，更多精彩内容，请关注GRE频道!


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