题目内容

Large search engines can index 80% of the current size of the Web.

A. 对
B. 错

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It's not difficult for a crawler to download the most relevant pages.

A. 对
B. 错

Designing a good selection policy cannot work with partial information.

A. 对
B. 错

During crawling, a crawler cannot get to know the complete set of Web pages, therefore it cannot design a good selection policy either.

A. 对
B. 错

Focused crawler or topical crawler is such a crawler to download pages similar to each other.

A. 对
B. 错

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