search engines 此处考查第五点研究策略:“Use Internet directories and search engines selectively to locate authoritative,high-quality website

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答案search engines

解析 此处考查第五点研究策略:“Use Internet directories and search engines selectively to locate authoritative,high-quality websites.”,即利用互联网名录和搜索引擎有选择地寻找权威可靠的高质量网站,因此填入search engines。
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