Questions 11 to 18 are based on the conversation you have just heard.

A．Right-handed people are superior to left-handed people.
B．Right-handedness is determined genetically, but left-handedness is learnt.
C．About 18% of identical twins are left-handed.
D．Scientists have not yet reached agreement on the causes of left-handedness.

A．Going back to the boarding school.
B．Three month’s imprisonment.
C．Never living with his mother again.
D．120 hours of community service.