Writing well is no accident. Neither is it something students bring into the world with them. Writing well is a skill that is learned. It takes time and effort, but it is a learnable skill and can be achieved by every...Writing well is no accident. Neither is it something students bring into the world with them. Writing well is a skill that is learned. It takes time and effort, but it is a learnable skill and can be achieved by everyone. This paper presents an overview of the basic skills of writing essays and papers in English, the kind of writing students use most often in college. It also reviews the main elements of grammar and the principles of good writing--the base upon which students learn or build their skills.展开更多
The quality of course books decides the quality of teaching. It is important to evaluate course books. The author analyzes "Reading and Writing Book" of "21st Century College English" based on the ...The quality of course books decides the quality of teaching. It is important to evaluate course books. The author analyzes "Reading and Writing Book" of "21st Century College English" based on the Nuttal’s reading model. Firstly, this model is presented in the open- ing part. Secondly, then the author discusses suitability of the course book from its content variety, authenticity and the training of language skills. Thirdly, how Nuttal’s reading prin- ciples and reading skills are reflected in such book is analyzed. Based on the discussion and analysis, conclusions are drawn that it is suitable for reading instruction; many of the reading principles and reading skills are well embodied and trained in this book. Finally suggestions are presented in the conclusion part. These suggestions include: 1) this book should be adopted more authentic materials such as poems, advertisements, recipes, travel guidebooks and so on; 2) teachers may present and train students’ reading skills systematically; 3) teachers should provide more and better non-linear text, such as col- ored pictures, reference book list, etc.展开更多
The cold vortex is a major high impact weather system in northeast China during the warm season, its frequent activities also affect the short-term climate throughout eastern China. How to objectively and quantitative...The cold vortex is a major high impact weather system in northeast China during the warm season, its frequent activities also affect the short-term climate throughout eastern China. How to objectively and quantitatively predict the intensity trend of the cold vortex is an urgent and difficult problem for current short-term climate prediction. Based on the dynamical-statistical combining principle, the predicted results of the Beijing Climate Center＇s global atmosphereocean coupled model and rich historical data are used for dynamic-statistical extra-seasonal prediction testing and actual prediction of the summer 500-hPa geopotential height over the cold vortex activity area. The results show that this method can significantly reduce the model＇s prediction error over the cold vortex activity area, and improve the prediction skills. Furthermore, the results of the sensitivity test reveal that the predicted results are highly dependent on the quantity of similar factors and the number of similar years.展开更多
Objective： To analyze the effect of cytarabine combined with vincristine on HL-60 cell line in vitro. Methods： The median-effect equation and MTr assay were used on HL-60. Results： The cytotoxic activity of cytarab...Objective： To analyze the effect of cytarabine combined with vincristine on HL-60 cell line in vitro. Methods： The median-effect equation and MTr assay were used on HL-60. Results： The cytotoxic activity of cytarabine（Ara-C） and vincristine （VCR） used alone or in combination enhanced as drug concentration increased. The order of administration did not influence the cytotoxic activity of the combined antitumor drugs. The ratio of drug concentration was a factor to influence the killing effect. The interaction of the agents was synergistic at lower concentration, and antagonistic at higher concentration. Conclusion： The combined drugs interaction（CI 〈 1 ） was synergistic at lower concentration and antagonistic at higher concentration. The ratio of drug concentration is a significant factor that can influence the killing effect.展开更多
<Abstract>knowledge is a source and treasury in life.Language science is remarkably significant and valuable in knowledge acquisition.English as an approach turns up to be indespensable in language acquisition.I...<Abstract>knowledge is a source and treasury in life.Language science is remarkably significant and valuable in knowledge acquisition.English as an approach turns up to be indespensable in language acquisition.It plays an important role in verbal communication not only in the interculture but also crossculture.As far as English learning is concerned,in order to be proficient in various techniques,we should focus our attention on listening,speaking,reading,writing and translating.Comparatively speaking,speaking skills are more challenge and influential.展开更多
文摘Writing well is no accident. Neither is it something students bring into the world with them. Writing well is a skill that is learned. It takes time and effort, but it is a learnable skill and can be achieved by everyone. This paper presents an overview of the basic skills of writing essays and papers in English, the kind of writing students use most often in college. It also reviews the main elements of grammar and the principles of good writing--the base upon which students learn or build their skills.
文摘The quality of course books decides the quality of teaching. It is important to evaluate course books. The author analyzes "Reading and Writing Book" of "21st Century College English" based on the Nuttal’s reading model. Firstly, this model is presented in the open- ing part. Secondly, then the author discusses suitability of the course book from its content variety, authenticity and the training of language skills. Thirdly, how Nuttal’s reading prin- ciples and reading skills are reflected in such book is analyzed. Based on the discussion and analysis, conclusions are drawn that it is suitable for reading instruction; many of the reading principles and reading skills are well embodied and trained in this book. Finally suggestions are presented in the conclusion part. These suggestions include: 1) this book should be adopted more authentic materials such as poems, advertisements, recipes, travel guidebooks and so on; 2) teachers may present and train students’ reading skills systematically; 3) teachers should provide more and better non-linear text, such as col- ored pictures, reference book list, etc.
基金supported by the National Natural Science Foundation of China(Grant No.41375078)the National Basic Research Program of China(Grant Nos.2012CB955902 and 2013CB430204)the Special Scientific Research Fund of Public Welfare Profession of China(Grant No.GYHY201306021)
文摘The cold vortex is a major high impact weather system in northeast China during the warm season, its frequent activities also affect the short-term climate throughout eastern China. How to objectively and quantitatively predict the intensity trend of the cold vortex is an urgent and difficult problem for current short-term climate prediction. Based on the dynamical-statistical combining principle, the predicted results of the Beijing Climate Center＇s global atmosphereocean coupled model and rich historical data are used for dynamic-statistical extra-seasonal prediction testing and actual prediction of the summer 500-hPa geopotential height over the cold vortex activity area. The results show that this method can significantly reduce the model＇s prediction error over the cold vortex activity area, and improve the prediction skills. Furthermore, the results of the sensitivity test reveal that the predicted results are highly dependent on the quantity of similar factors and the number of similar years.
文摘Objective： To analyze the effect of cytarabine combined with vincristine on HL-60 cell line in vitro. Methods： The median-effect equation and MTr assay were used on HL-60. Results： The cytotoxic activity of cytarabine（Ara-C） and vincristine （VCR） used alone or in combination enhanced as drug concentration increased. The order of administration did not influence the cytotoxic activity of the combined antitumor drugs. The ratio of drug concentration was a factor to influence the killing effect. The interaction of the agents was synergistic at lower concentration, and antagonistic at higher concentration. Conclusion： The combined drugs interaction（CI 〈 1 ） was synergistic at lower concentration and antagonistic at higher concentration. The ratio of drug concentration is a significant factor that can influence the killing effect.
文摘<Abstract>knowledge is a source and treasury in life.Language science is remarkably significant and valuable in knowledge acquisition.English as an approach turns up to be indespensable in language acquisition.It plays an important role in verbal communication not only in the interculture but also crossculture.As far as English learning is concerned,in order to be proficient in various techniques,we should focus our attention on listening,speaking,reading,writing and translating.Comparatively speaking,speaking skills are more challenge and influential.
