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题库 / Prep2007E1-SC-66
Africa's black rhino population in the mid-1970's numbered about 20,000, ten times the estimated population of 2,000 in 1997.
the estimated population
that of their estimated population
more than the population's estimated amount
more black rhinos than their population estimate
more than that of their population's estimated amount
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B为什么错的呢 是their加上去不简洁吗
that指代前面的population, 就变成 population of their estimated population
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