搜索引擎种类多种多样。通过互联网上提取的各个网站的信息而建立的数据库，检索与用户查询条件匹配的相关记录，然后按照一定的顺序将结果反馈给用户的搜索引擎是( )。
A．目录索引类搜索引擎
B．元搜索引擎
C．集合式搜索引擎
D．全文搜索引擎
参考答案：D
解析： 全文搜索引擎是指通过从互联网上提取的各个网站的信息(以网页文字为主)而建立的数据库，检索与用户查询条件匹配的相关记录，然后按照一定的顺序将结果反馈给用户。国内外具有代表性的全文搜索引擎有Google、Alta Vista、Inktomi、百度等。
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| Mrs smith's Class This is Mrs Smith's classroom. It is Class Two, Grade Two of No. 14 Middle School. Mrs Smith usually 1 in front of the blackboard. She often 2 to her students and sometimes writes 3 the blackboard. Her class is quite big. There are 4 students in her class. Some of them are not Chinese, 5 they are all good friends. Li Lei and Jim are not tall. They sit in the 6 row. Wei Hua and Hua Fei 7 in the second row. The twins sit 8 the middle of the classroom. Bill is 9 than most of the class. He sits in the back row. Lin Tao is on the right hand side. Li Ming sits 10 the left hand side. |
| ( )1. A. sings ( )2. A. reads ( )3. A. to ( )4. A. much ( )5. A. and ( )6. A. right ( )7. A. sits ( )8. A. on ( )9. A. taller ( )10. A. beside | B. sits B. talk B. in B. a few B. but B. middle B. sit B. of B. shorter B. near | C. walks C. phones C. on C. some C. or C. front C. stand C. in C. tallest C. inside | D. stands D. smile D. at D. a lot of D. yet D. back D. go D. at D. higher D. on |