动物 Pop Quiz

How long 以前 did dolphins appear for the first time?
 How long 以前 did dolphins appear for the first time?
Choose the right answer:
Option A 15.000.000 years
Option B 13.000.000 years
Option C 8.000.000 years
Option D 20.000.000 years
 Annitaki posted 一年多以前
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