共用题干
Multiple Sclerosis（多发性硬化症）
central nervous system.This can lead to numerous physical and mental symptoms,as the disease affects the
transmission of electrical signals between the body and the brain.However,the human body,being a flexi-
ble,adaptable system,can compensate for some level of damage,so a person with MS can look and feel fine
even though the disease is present.primary progressive form.In the relapsing form,the disease progresses in a series of jumps;at times it is in
remission（减轻）,which means that a person's normal functions return for a period of time before the sys-
tem goes into relapse and the disease again becomes more active.This is the most common form of MS; cycle can continue for many years.Eventually,however,loss of physical and cognitive functions starts to
take place and the remissions become less frequent.physical and cognitive functions takes place.This condition affects about 10％～15% of sufferers at
diagnosis.the disease,the patient's individual characteristics and the initial symptoms.Life expectancy of patients,
however,is often nearly the same as that of an unaffected person一provided that a reasonable standard of
care is received.In some cases a near-normal life span is possible.性）,which is triggered by some unknown environmental factor. Onset（发作）of the disease usually occurs in
young adults between the age 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. MS affects the communication of nerve cells between the body and__________.