单项选择题

The author was required to submit an ______ of about 200 words together with his research paper.

[A] edition
[B] editorial
[C] article
[D] abstract
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单项选择题
When I came through the customs at the airport, I had to pay ______ on a camera I had bought.
[A] taxes
[B] duty
[C] fine
[D] rates
单项选择题
You'd better add it up. I'm not good at ______ .
[A] figures
[B] counters
[C] characters
[D] summaries
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