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

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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 1 billion. Choice(B) is when the population reached 2 billion. Choice(C)is when the population reached 2.5 billion.
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