A、20% B、30% C、40% D、50% A

McDonald’s Corp. unveiled a health campaign on Thursday starring an adult "Happy Meal" with salad, bottled water and a pedometer, but some critics weren’t buying the fast food giant’s healthy message.
   The company said it will launch the "Go Active" meals for adults on May 6 nationwide. The meals will be boxed with a brochure urging customers to walk more.
   McDonald’s, the target of obesity lawsuits and criticism of its fatty foods from dietary experts, already has been promoting healthier choices on its menu such as new salads.
   More than 30 percent of U. S. adults are obese, according to the Centers for Disease Control and Prevention.
   Food industry watchdog Michael Jacobson said the McDonald’s announcement "advances public relations more than it does public health."
   McDonald’s said new advertisements will promote "balanced lifestyles" and encourage consumers to burn off the calories through exercise.
   In June, McDonald’s restaurants nationwide will offer alternatives to French fries in children’s "Happy Meals" such as peeled apple slices with low-fat caramel dipping sauce.