题目内容
（请给出正确答案）
[主观题]
What does "hundreds of millions" （Line 3, Para. 1) refer to？A．Zoos in the whole world.B．Pe
What does "hundreds of millions" (Line 3, Para. 1) refer to？
A．Zoos in the whole world.
B．People who have seen the wild animals in the zoo.
C．Live wild animals displayed.
D．Persons in charge of zoos.
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