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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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A，the+名词指代前面出现过的名词
但这里the estimated population of 2,000 in 1997，无论是estimated还是2000还是In 1997都在做定语修饰population，已经将population定住了，所以它不会再指代population in 1970
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