53. Based on the ideas presented in the passage we can conclude "being fat" ________ in American society.

　　[A] will always remain a taboo

　　[B] is not considered as a taboo by most people

　　[C] has long been a taboo

　　[D] may no longer be a taboo someday

　　54. The topic of fat is ________ many other taboo subjects.

　　[A] the same as

　　[B] different from

　　[C] more popular than

　　[D] less often talked about than

　　55. What does "thin is 'in', and fat is 'out'" mean?

　　[A] Thin is "inside", and fat is "outside".

　　[B] Thin is "diligent", and fat is "lazy".

　　[C] Thin is "youthful", and fat is "spiritless".

　　[D] Thin is "fashionable", and fat is "unfashionable".

　　56. Apart from this new understanding of the correlation between health and exercise, the main reason the passage gives for why so many Americans are exercising regularly is ________.

　　[A] their changed life style

　　[B] their eagerness to stay thin and youthful

　　[C] their appreciation of the importance of exercise

　　[D] the encouragement they have received from their companies