题目：【阅读理解】

    The strange close understanding between twins is a familiar enough phenomenon. Often they seem to understand each other and share each other' s emotions to such an extent that one suspects some kind of thought communication.

    What is not so widely known is that this special relationship often acts as brake on twins ' intellectual development. As they are partly isolated in their own private world, twins communicate less with adults than do other children. The verbal ability of a four-year-old twin is typically six months behind that of a non-twin. The problem can be particularly severe in an underprivileged family, a one-parent family for example, where there is little stimulation for children anyway.

    Such children, while capable of mutual comprehension in a private language, often remain incomprehensible to outsiders and thus at a severe educational disadvantage. The only solution to the problem. cruel though it may seem, is to separate the twins thus forcing them to acquire ordinary speech helped and guided by sympathetic parents and teachers.

【问题】What' s the reason for twins to be at a disadvantage in their intellectual development?

A. They can only understand their own private language.

B. They communicate with outsiders less than non-twins.

C. There is little stimulation for them.

D. Adults don ' t like to talk with them.

【答案】B

【考情点拨】事实细节题。

【应试指导】文章第三段第一句指出，双胞胎之间交际太多，而与其他人交际过少，这使他们智力发展中存在很大的不足。

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