In most American high schools, selling soft drinks is ______.

A．water is provided free
B．most kids can afford nothing but water
C．water machines are put in noticeable positions
D．children have realized the harm of sugary drinks

A．more children tend to smoke today than yesterday
B．both obesity and smoking require the attention of schools and society
C．the present plan on obesity would function similarly as a landmark
D．obesity and smoking are both health problems