What is the tone of this passage

A．tunnels are dangerous to public health
B．the noise and the glare of the engine fire may affect people's nerves
C．to those with high blood pressure, the rapid speed of the train causes them to die
D．the rapid speed through the air does damage to people’s lungs

A．a boy and a girl usually fight when they are together
B．railway leads the world to peace
C．people tend to be together more than they used to be
D．a lot of people being together makes fights likely