The now extinct passenger pigeon has the dubious honor of being the last spe

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问题    The now extinct passenger pigeon has the dubious honor of being the last species anyone ever expected to disappear. At one point, there were more passenger pigeons than any other species of bird. Rough【C1】________of their population went as high as five billion and they accounted for around 40 percent of the total indigenous bird population of North America in the early 19th century.
Despite their huge population, passenger pigeons were【C2】________to human intrusion into their nesting territory. Their nests were shabby things and two weeks after the eggs【C3】________. the parent pigeons would abandon their offspring, leaving them to take care of themselves. People discovered that these baby pigeons were really tasty, and the adult birds were also quite【C4】________. First the Native Americans and then the transplanted Europeans came to consider the birds a great【C5】________.
By the 1850s, commercial trapping of passenger pigeons was proceeding at an【C6】________pace. Hundreds of thousands of the birds were being harvested every day to be made into popular pigeon pies. In addition, large【C7】________of the pigeons’ nesting territory were being cleared away for planting crops and creating pasture land. As numerous as the passenger pigeons were, they were not an【C8】________resource. By the 1880s, it was noticed that the bird population had become seriously【C9】________. The last passenger pigeons killed in the wild were shot in 1899.
Eventually those billions and billions of birds shrank to a single remaining【C10】________. a passenger pigeon named Martha, who died on September 1, 1914, in captivity at the Cincinnati Zoo. In addition to being the end of an era, it was also the first time humans were able to exactly time the extinction of a species.
A) vulnerable F) refuge    K) excerpts
B) unprecedented G) plazas    L) estimates
C) tracts       H) infinite M) edible
D) specimen    I) hatched N) depleted
E) robust       J) expired O) delicacy [br] 【C1】

选项

答案 L

解析空格前为形容词Rough，空格后为介词短语of their population，由此可知，空格处应填入一个被形容词Rough修饰的名词。由本句中的went as high as five billion可知，这里在讲述旅鸽的数量，而由于数量众多(高达50亿) ，因此这一数量只能是估算出来的数量，故estimates符合语境。

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