Questions 19 to 22 are based on the conversation you have just heard.

A．Because she feels very hot in the room.
B．Because she wants to avoid meeting people.
C．Because she wants to smoke a cigarette outside.
D．Because she doesn’t like the smell of smoke inside.

A．Music they like can relieve depression but distract attention.
B．Music they like can reduce stress and improve concentration.
C．Classical music and rock-and-roll increase their heart rate and expand the breathing.
D．Wearing headphones can help concentrate when they are performing operations.