Why Don't We Speak 2 Languages

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Found on Beijing Tourism
http://bit.ly/2c9OT2R

   I find it interesting that most of the world knows our language, but why don't we know others? Did you know that 350 Million people around the world speak English, with 50 countries slotting it as the official or primary language? To date, we are only behind Mandarin and Spanish in most known language in the world.

   This is what really puzzles me. Even though more people in the world know Mandarin and Spanish, they are more likely to know our language than we are of theirs.