单项选择题

A. You’re wrong.
B. I don’t think so, I’m afraid.
C. Not at all.
D. No, that’s not real.
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Paper, like many other things that we use today, was first made in (11) . In Egypt and the West, paper was not very commonly used before the year (12) . The Egyptians wrote on a kind of material made of a water (13) Europeans used parchment for many hundreds of years. Parchment was very strong; it was (14) the skin of certain young animals. We have learnt of the most important facts of European history from (15) that were kept on parchment.
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His efforts to improve the sales of this product have been very (help) ______.
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