For most people, the left half of the brain controls linguistic capabilities,
but some people have their language centers in the right half. When a language
center of the brain is damaged,for example by a stroke,linguistic capabilities
are impaired in some way. Therefore, people who have suffered a serious stroke
on the left side of the brain without suffering any such impairment must have
their language centers in the right half.
Which of the following is an assumption on which the reasoning in the argument above depends?
A) No part of a person's brain that is damaged by a stroke ever recovers.
B) Impairment of linguistic capabilities does not occur in people who have not
suffered any damage to any language center of the brain.
C) Strokes tend to impair linguistic capabilities more severely than does any
other cause of damage to language centers in the brain.
D) If there are language centers on the left side of the brain, any serious
stroke affecting that side of the brain damages at least one of them.
E) It is impossible to determine which side of the brain contains a person's
language centers if the person has not suffered damage to either side of
the brain.
答案是D 我选了B 请益! 谢谢各位前辈!