B.Friends share similar eating habits.
C.Friends are more important than family members.
D.Friends affected each others’feelings of fatness.
14、Which factor of becoming obese is not mentioned in this report?
A.Social contact.
B.Genetic information.
C.Life style.
D.Environmental influences.
15、In what way is obesity contagious and epidemic?
A.Social networks let the obesity spread rapidly.
B.1ndividuals have genetically determined ranges of weights.
C.Obesity can easily spread from one to another without any physical contact.
D.Obesity can spread rapidly and extensively by infection and affecting many individuals in an area or a population at the same time.
参考答案：11.A 12.C 13.D 14.C 15.A