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D:When（ ）is the most frequent structures occurred in the research paper titles in sciences.D:1）-2) – 3) -4） 答案: 1）-2) – 3) -4）D:what you discover from the experimentWhen we summarize the main idea, ( ) is a good and common method.B:describing the studyA:a kind of decoration答案: What ;whyA:The Full- sentence constructionWhich kind of the abstract is it? ( )答案: reviewed literature ;recent developmentA:organizingC:analyzing dataB:a sort of signal
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