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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) that只能指代rhino population,从而跟后面的their estimated population意思重复
(C) the population’s estimated amount表达笨拙,复杂
(D) 表达复杂,笨拙；their没有指代对象。
(E) 表达复杂,笨拙,that指代rhino population和their population’s estimated amount意思重复；their没有指代对象
从句子意思考虑，原文给出了具体数字，我们可以看出CDE都有问题，是9 times more 而非10 times more
表示倍数是可以直接用倍数（数字+times）的，就像double后面是可以直接加名词的。
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