{{i}}quEstions 17 - 20 ArE BAsED on thE Following tAlk. you now hAvE 20 sEConDs to rEAD quEstions 17- 20.{{/i}}

FEmAlE ChimpAnzEEs hAvE onE BAByA．onCE 11 months.
B．onCE 5 months.
C．onCE 13 months.
D．onCE 12 months.