45. Based on the article, the difficulty for a child to learn a language lies in
(A) the number of commonly used words in a language.
(B) the way a language is taught in the classroom.
(C) the number of distinct sounds in the language.
(D) the amount of exceptions in the language.
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統計: A(0), B(0), C(0), D(1), E(0) #3354382
統計: A(0), B(0), C(0), D(1), E(0) #3354382