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【单选题】
The main purpose of the talk isA.
to introduce categories of books in US libraries.
B.
to demonstrate the importance of US libraries.
C.
to explain the roles of different US libraries.
D.
to define the circulation system of US libraries.
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A.
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C.
Enable visitors to have first impression within 50 milliseconds which accord to that after a long examination.
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Eliminate the minor errors in the content of the website.
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