题目内容：
根据以下内容回答题：Curiosity is not only a possible motivation，it is also a great help in your learning langua-ges．Remember that a language is not(1)a grammatical system．It is the(2)of a cer-tain culture of different cultures．It is no good(3)strings of words and lists of grammatical rules(4)you know as much as possible about the background of the language，so that you can understand the ideas conveyed and the references made，as well as the inferences whichCan(5)the information clearly given．So learn as much as you can about the different cul．tures which(6)English--watch television programs，listen to the radi0，try to obtain(7)and magazines written by native speakers，look at advertisements，and，above all，read——nottextbooks，(8)novels，poems and plays．They will show you how a language is(9)used．The English language is a living form of expression which derives much of its(10)from the context，and much of its effect from a whole network of extra-linguistic knowledge．
请回答(1)题 A．just
B．even
C．so
D．that
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答案解析：