Our information about the population of the earth before the first century after Christ comes mainly from ______. It is estimat

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问题 Our information about the population of the earth before the first century after Christ comes mainly from ______.
It is estimated that in the year A)D)100 the population of the earth was about ______.

选项 A、800 thousand
B、1 million
C、250 million
D、500 million

答案C

解析 细节推断题。从文中第一段第一句不难看出此题的答案为C。
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