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Unless the application of a new discovery is clear and present, most are dubious of its value.（）
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An Introduction To Writing ParagraphsDefinition of A ParagraphA paragraph is a group of sentences which presents and develops one idea or one aspect of an idea.Placement and Length of A ParagraphThe basic rules to follow for the length of the paragraphs you write is: make the paragraph long enough to develop its central idea clearly and completely. Don’t make a paragraph so short that its content is not well explained; don’t make a paragraph so long that it contains ideas that do not relate to the central idea or becomes repetitions and boring.Kinds of ParagraphsParagraphs can be classified in two ways: by what they do and by the kind they are. When we think of them in terms of what they do, we find that paragraphs can have four different functions: they can be used as introductions, as support for or development of a topic, as transitions, or as conclusions. When we think of paragraphs in terms of the kind they are, we find that there are four basic types of paragraphs that include all prose writing: exposition, argumentation, description, and narration.Paragraphs and Longer Forms of WritingJust as groups of related words make up sentences and groups of related sentences make Up paragraphs, groups of related paragraphs make up longer pieces of writing, such as essays, reports, research papers, business and social letters, technical manuals, articles, stories, and chapters in books.SubheadingsContentsDefinition of a paragraph.A group of sentences which (46) one idea.(47) of a paragraph.Make the paragraph long enough to develop its (48) clearly and completely.Kinds of paragraph.Four different functions and (49) of paragraphs.Paragraphs and longer forms ofwriting.Groups of (50) make up longer pieces of writing. 46（）
An Introduction To Writing ParagraphsDefinition of A ParagraphA paragraph is a group of sentences which presents and develops one idea or one aspect of an idea.Placement and Length of A ParagraphThe basic rules to follow for the length of the paragraphs you write is: make the paragraph long enough to develop its central idea clearly and completely. Don’t make a paragraph so short that its content is not well explained; don’t make a paragraph so long that it contains ideas that do not relate to the central idea or becomes repetitions and boring.Kinds of ParagraphsParagraphs can be classified in two ways: by what they do and by the kind they are. When we think of them in terms of what they do, we find that paragraphs can have four different functions: they can be used as introductions, as support for or development of a topic, as transitions, or as conclusions. When we think of paragraphs in terms of the kind they are, we find that there are four basic types of paragraphs that include all prose writing: exposition, argumentation, description, and narration.Paragraphs and Longer Forms of WritingJust as groups of related words make up sentences and groups of related sentences make Up paragraphs, groups of related paragraphs make up longer pieces of writing, such as essays, reports, research papers, business and social letters, technical manuals, articles, stories, and chapters in books.SubheadingsContentsDefinition of a paragraph.A group of sentences which (46) one idea.(47) of a paragraph.Make the paragraph long enough to develop its (48) clearly and completely.Kinds of paragraph.Four different functions and (49) of paragraphs.Paragraphs and longer forms ofwriting.Groups of (50) make up longer pieces of writing. 49（）
I love traveling by train. Fast expresses, slow local trains which stop at every station, suburban trains taking business men to their offices and home again;I enjoy them all It must be the element of romance that attracts me. There’s no romance in a car on a motor way-a box of metal and rubber(橡胶) on a strip of concrete-or in flying through the air in a pressurized tube from one identical plastic and glass airport to another. But trains are different. You can Walk around, look at the scenery, observe your fellow passengers, In a plane all you can see are the clouds and the backs of other people’ s heads. And then there are the stations.Yes, traveling by train is still an adventure, even in England, as you try to interpret the timetable, persuade the booking office clerk to sell you a ticket and understand the incomprehensible messages coming over the loudspeaker system. Then there’ s that delightful uncertainty as you wonder whether you are on the right train, or the right part of the train. Why is the author so fond of trains It is because of its（）
简述电位法测pH值的基本原理。
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