Directions：Complete the following passage by filling in each blank with one word that best fits the context.
Search engines are a type of computer program. The links that you get are not classified by subject. These engines search the Internet for you based 1_______ the key words you type in, 2______choose web pages for you 3_____contain the words you ask for. The contents they search have not been evaluated. This means that the information has never been checked—it could be reliable, true information 4_____ false information written by a person 5_____ qualifications or someone who does not have solid facts. 6_____links you obtain from the search engine go to full articles or pages. This requires 7_____ to be patient as you have to read the information to decide whether it is linked to 8____ you are searching. Examples of famous search engines are Google, Yahoo and Baidu. You can also go to the www.thesearchenginelist.com website and check their list of search engines.

科目 英语   题型 单词拼写   难度 较难