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What is the main idea of Pale Blue Dot by Carl Sagan？

What is the main idea of Pale Blue Dot by Carl Sagan？
A.Our planet is a lonely speck.
B.Humans have imagined self-importance.
C.We should cherish our earth.
D.There are a lot of conflicts on our earth.
正确答案：We should cherish our earth.

标签：主题英语

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