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】 Many people don ' t know that         .

A. twins understand each other very well

B. twins are slow to learn to talk

C. twins are unlikely to do less well at school than other children

D. there exists more communication between twins

【答案】B

【考情点拨】事实细节题。

【应试指导】文章第二段指出，很多人还不知道，由于双胞胎与其他人交际少导致一对四岁的双胞胎儿童的语言能力明显落后。故选B。

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