单选题
What did the development of silent reading during the nineteenth century indicate?
A、
An increase in the number of listeners.
B、
An increase in the number of books.
C、
A decrease in literacy.
D、
A change in the nature of reading.
【正确答案】
D
【答案解析】
[解析] 从文章第二段最后一行mainly because the tasks themselves changed in character可知，答案应选D。
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