The method works best cases where total deafness is due to malfunctioning of the ear’s sensory cells.There must be sufficient functioning nerve fibers available to transmit the message to the brain（ ）;there are generally no more than 10 percent remaining in most cases,since they tend to atrophy with disuse.A.fortunatelyB.spontaneouslyC.basicallyD.unfortunately
The method works best cases where total deafness is due to malfunctioning of the ear’s sensory cells.There must be sufficient functioning nerve fibers available to transmit the message to the brain（ ）;there are generally no more than 10 percent remaining in most cases,since they tend to atrophy with disuse.
A.fortunately
B.spontaneously
C.basically
D.unfortunately
B.spontaneously
C.basically
D.unfortunately
参考解析
解析：由于大多数病例中，其次听神经纤维留下的一般不超过计划10%，均因长期不用而逐渐萎缩。对于这一事实不能说是“幸运”（fortunately），只能说是“不幸”（unfortunately），故选D
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