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27.What does the author want to do in the last paragraph?A.Inspire us with his lessonsB.Persuade us to major in businessC.Recall the key moments of his entrepreneurship.30.D.Advocate avoiding obstacles on the way to success31Historical accounts often described the now-extinct California grizzly bears as huge beaready to attack humans and livestock at any time.But according to a new paper,scientiststhe truth might have been less dramatic:The bears ate a mostly vegetarian diet and weresmaller than previously described.California grizzly bears once roamed in the Golden State园But European settlers often hunted,poisoned and trapped the creatures.Over time,becauseof these human activities,the California grizzly population declined.The last reliable sightingof a California grizzly bear occurred 100 years ago in 1924,and the animals disappeared如completely sometime after that.Researchers wanted to get a better understanding of the factors that accelerated the bears的extinction.They also hoped to gain more insight into the creatures'behavior,size and diet.To do so,they turned to documents and California grizzly specimens in natural historycollections.They measured the animals'skulls and teeth and analyzed their bones and pelts.The researchers found that California grizzly bears were much smaller than the 2,000 pounds工often reported at the time.Historical accounts might not necessarily have been wrong,butthey might have only included the largest bears.In addition,analyses of the animals'bones新and skins suggest the bears were primarily eating plants,which stands in contrast to theirfearsome hypercarnivorous(超级食肉的)reputation.“The bears likely increased meat名consumption due to landscape changes coupled with the arrival of livestock,"says study coauthor Alexis Mychajliw.However,researchers found the animals still ate a majorityvegetarian diet and killed far less livestock than historical accounts suggested.By digging beyond the bears'reputation,the researchers gained a more accurateunderstanding of the California grizzly's biology and natural history.And since scientists andland managers often rely on historical accounts when reintroducing animals to their formerhabitats,the study serves as a reminder that those old newspapers and journals do not tell thewhole story.28.What does the underlined word "roamed"in paragraph 1 mean?C.Fought.D.Wandered.A.Disappeared.B.Declined.29.What did the researchers discover about California grizay bears?A.They mainly fed on livestock.B.Their diet consisted mostly of plants.C.They ate a balanced diet of plants and meat.D.The absence of livestock changed their dietary habit.·24-473C※·【高三英语第5页（共10页）】