3 In the primary progressive form of MS, there are no remissions and a continual but steady loss of physical and cognitive functions takes place. This condition affects about 10-15% of sufferers at diagnosis.
4 The expected course of the disease, or prognosis(预后),depends on many variables: the subtype of the disease, the patients individual characteristics and the initial symptoms. Life expectancy of patients, however, is often nearly the same as that of an unaffected person - provided that a reasonable standard of care is received. In some cases a near-normal life span is possible.
5 The cause of the disease is unclear; it seems that some people have a genetic Susceptibility(易感性),which is triggered by some unknown environmental factor. Onset(发作)of the disease usually occurs in young adults between the ages of 20 and 40.It is more common in women than men; however, it has also been diagnosed in young children and in elderly people.
23. Paragraph 1___E___
24. Paragraph 2 __B____
25. Paragraph 3___D___
26. Paragraph 4____F__
A. The cause of MS
B. The relapsing form of MS
C. The treatment for MS
D. The primary progressive form of MS
E. The definition of MS
F. The development of MS
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