某同学在探究性学习中收集了下组图片，该组图片信息所反映的历史主题是（）

A.民族复兴之路

B.民主革命之路

C.社会主义道路

D.改革开放之路

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.

It is more and more usual that users of Information Retrieval (IR) systems must face up to response of hundreds or thousands of (66) documents. A significant proportion of them are moreover (67) or redundant. This is a straight consequence of two well - known facts: the incessant growing of documental databases and the lack of ability of most users to define (68) information needs. In such a framework, further effective retrieval techniques are only part of the solution. Interfaces with alternative ways for organizing and (69) the results returned by a (70) would be of great utility assisting users to find relevant documents. Document clustering may play a central role as an effective technique for organizing query results.

（66）是（）

A.replied

B.retrieved

C.received

D.relied