问题
单项选择题
The details of any language system is passed on from one generation to the next through （）, rather than by instinct.
A.learning
B.teaching
C.books
D.both A and B
答案
参考答案：D
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The details of any language system is passed on from one generation to the next through （）, rather than by instinct.
A.learning
B.teaching
C.books
D.both A and B
参考答案：D