WhatisthemainideaofPaleBlueDotbyCarlSagan?

WhatisthemainideaofPaleBlueDotbyCarlSagan?

A.Ourplanetisalonelyspeck.

B.Humanshaveimaginedself-importance.

C.Weshouldcherishourearth.

D.Therearealotofconflictsonourearth.

正确答案：C