CROWDING THE PLANET This chart shows how much the world’s population grew between 1900 and 2000, and how much experts believe

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问题                     CROWDING THE PLANET
   This chart shows how much the world’s population grew between 1900 and 2000, and how much experts believe it will grow by 2025. The numbers are in billions.

In what year did the population reach 4 billion?

选项 A、1900
B、1925
C、1950
D、1975

答案D

解析 In 1975 the population reached 4 billion. Choice (A) is when the population reached I billion. Choice (B) is when the population reached 2 billion. Choice (C) is when the population reached 2.5 billion.  
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