66. Who has the high risk of getting arthritis?
[A] Men in their 50’s.
[B] Women in their 20’s.
[C] Women in their 50’s.
[D] Men in their 20’s.
67. According to the data given, how many American arthritis patients are male?
[A] About 18.5 million.
[B] About 15.5 million.
[C] About 10 million.
[D] About 27.5 million.
68. According to the passage, what is the main
cause of the osteoarthritis?
[A] Overweight of the cartilage.
[B] The aging of the cartilage.
[C] The abrasion of the cartilage.
[D] The i
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