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

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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 that 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 exponent 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 事实细节题。参见第二段第一句"This helps explain why the population has come on ’all of a sudden’",逗号可知答案为C。这里this指的就是第一段第一句 "Population tends to grow at an exponential rate"。
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