C) People were not likely to lose weight when they have skinny friends.
D) The greatest influence of all was between close mutual friends.
3. According to Dr. Nicholas A. Christakis, what is the explanation for friends being the
greatest influence?
A) Friends usually spend a lot of time together.
B) Friends share similar eating habits.
C) Friends are more important than family members.
D) Friends affected each others feelings of fatness.
4. Which factor of becoming obese is not mentioned in this report?
A) Social contact.
B) Genetic information.
C) Life style.
D) Environmental influences.
5. In what way is obesity contagious and epidemic?
A) Social networks let the obesity spread rapidly.
B) Individuals 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.
答案与题解:
1. A 本题的答案可以在文章的第四段中找到。第四段中提到研究者发现,当周围朋友发福时,人最容易发胖。而邻居则不会对人产生影响,甚至家庭成员的影响也不如朋友大。至于同事,文章中并没有提到。
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