[填空题]

Fixing a World That Fosters Obesity

Environment Fostering Obesity
A．Why are Americans getting fatter and fatter The simple explanation is that we eat too much junk food and spend too much time in front of screens—be they television, phone or computer—to burn off all those empty calories. One handy prescription for healthier lives is behavior modification. If only people ate more fresh produce. If only children exercised more. Unfortunately, behavior changes won’t work on their own without huge societal shifts, health experts say, because eating too much and exercising too little are merely symptoms of a much larger disease. The real problem is a landscape littered with inexpensive fast-food meals; much advertising for fatty, sugary products; inner cities that lack supermarkets; and unhealthy, high-stress workplaces. In other words, it’s the environment.
B．"Everyone knows that you shouldn’t eat junk food a