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  3. This passage chiefly discusses ______. According to the passage, what helps to explain why the population problem has come on "

This passage chiefly discusses ______. According to the passage, what helps to explain why the population problem has come on "

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问题 This passage chiefly discusses ______.
According to the passage, what helps to explain why the population problem has come on "all of a sudden"?
选项 A、The penny which doubles itself every day for one month.
B、The time span of at least two million years in human history.
C、An illustration of the exponential growth rate given by the author.
D、The large amount of money you would luckily make after the fourth week.
答案C
解析 细节题。文章第二段第一句谈到This helps explain why the population has come on "all of a sudden"，而根据上下文，this指代前文关于硬币的例子。
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考研英语一

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