【正确答案】By creativity, language is designed to make its users form and understand an infinite sentences, most of which are never before produced or heard．For instance, we can write a sentence like the following and go on endlessly: "He bought a book which was written by a teacher who taught in a school which was known for its graduates who...".

【答案解析】[解析] 本题考查语言的本质特征之创造性。创造性是指语言的能产性，因为语言有二重性和递归性。语言具有构成无穷的句子的潜力，它的递归性又为这种可能提供了理论基础。