The idea of the national boundaries is often diff
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The idea of the national boundaries is often different from_____.
A..that of a speech community
B. can a speech community be formed
C. in order to learn English better
D. for the sake of simplicity
E. has played an important role in the field of education
F. is widely used in several areas of public activity
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答案：A
答案来自第二段第四句话，该句说明国界与语言群体的界限并不总是一致的。选项中涉及语言群体的只有A和B项，上题已经选择B项，所以只有A合适，A项中的 that用来代替the+有关前述名词。故选A。