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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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AB区别：
先说CDE, 这里是整10 times，所以不需要和more than 搭配，如果用9 time 就要加more than
B的that of冗余，没有可以代指的对象
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