A) international cooperation B) nationalistic reasons

　　C) scientific research D) long-term profits

　　同学们有没有发现：economic / commercial / financial / profit ; nationalistic / political / military / cold war / nationalism; science / scientist/ scientific 都是近义词或同一范畴的词，也就是阅读文章中经常出现的同义换词现象。如果一个词的同义词、相关词在一篇文章中多次重复出现，必定是这篇文章的强调的地方，必定和考题相关。另外，请注意这两到题的考法，先考过去，再考现在，一个是was, 一个是is。答案D、C。

　　【例四】

　　Hunting for a job late last year, lawyer Gant Redmon stumbled across CareerBuilder, a job database on the Internet. He searched it with no success but was attracted by the sites personal search agent. Its an interactive feature that lets visitors key in job criteria such as location, title, and salary, then emails them when a matching position is posted in the database.

　　.

　　Some sites design their agents to tempt job hunters to return. When CareerSites agent sends out messages to those who have signed up for its service, for example, it includes only three potential jobs those it considers the best matches. There maybe more matches in the database; job hunters will have to visit the site again to find them and they do.

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