a child can be taken as mentally retarded if he or she. Which of the following is NOT true of mental retardation?

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问题 a child can be taken as mentally retarded if he or she.
Which of the following is NOT true of mental retardation?

选项 A、It is not curable.
B、Its victims are usually born with it.
C、Its causes are not fully identified yet.
D、It can spread among family members.

答案D

解析 短文的第五段提到,mental retardation本身并不是一种病,也不具有传染性。
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