He was very rude to the customs officer, _____ of course made things even worse.

A．children are reluctant to help each other
B．schools lay too much emphasis on co-operation
C．children should grow up with competitive ideas
D．schools give little actual instruction to children

A．tends to keep a distance between himself and the person he is speaking to
B．usually stands close to the person he is talking to
C．is often unfriendly when spoken to
D．is often cold and distant when speaking