Children aged two or three who suffer brain damage may lose all or part of the language they have learned, but are able to begin the learning process again, often progressing at a faster rate than before. When children suffer aphasia(失语症)between four and ten and begin learning language again, recovery is usually complete, even if requiring several years. Aphasias suffered after puberty, on the other hand, are rarely recovered from completely, and among those occurring after age eighteen, recovery is the exception rather than the rule, partial or total language loss usually being permanent.

When Krashen (1973) reexamined the data on speech loss and recovery after unilateral brain damage, plus that available from psychological and dicrotic listening tests, he found that the process of language lateralization, the shifting of most linguistic knowledge to the left hemisphere (in most right anded people), is completed far earlier than puberty, probably by age five in most cases. Further, the ability to transfer language function from the language?ominant hemisphere to the minor one when the former suffers damage also seems to disappear after five, although the idea that it may continue until puberty in some cases is a possibility, too, on the basis on the evidence available.

11.If the child suffers aphasia, he can recover completely ____.?
A.before the onset of puberty 　　B.after age eighteen?
C.before age two 　　　　　　　　　D.after puberty?
12.Which of the following statements is true??

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