问题
选择题
The invention of_________ paper was a great contribution to________human civilization.
A．a;a
B．the;the
C．/;/
D．the;/
答案
答案：C
paper 物质名词，意为“纸”，前面不加冠词；human civilization “人类文明”，习惯上前面也不用冠词。
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