This study is designed to examine how learning strategies and other different variables have affected the English language proficiency of a Chinese EFL Learner.Two interviews were conducted to collect data.It was found that the effective use of different learning strategies,the affective,socio-cultural,and educational variables have all contributed to her language proficiency.

This study is designed to examine how learning strategies and other different variables have affected the English language proficiency of a Chinese EFL Learner.Two interviews were conducted to collect data.It was found that the effective use of different learning strategies,the affective,socio-cultural,and educational variables have all contributed to her language proficiency.

Gene therapy is one of the most attractive fields in tumor therapy. In past decades, significant progress has been achieved. Various approaches, such as viral and non-viral vectors and physical methods, have been developed to make gene delivery safer and more efficient. Several therapeutic strategies have evolved, including gene-based (tumor suppressor genes, suicide genes, antiangiogenic genes, cytokine and oxidative stress-based genes) and RNA-based (antisense oligonucleotides and RNA interference) approaches. In addition, immune response-based strategies (dendritic cell- and T cell-based therapy) are also under investigation in tumor gene therapy. This review highlights the progress and recent developments in gene delivery systems, therapeutic strategies, and possible clinical directions for gene therapy.

Gene therapy is one of the most attractive fields in tumor therapy. In past decades, significant progress has been achieved. Various approaches, such as viral and non-viral vectors and physical methods, have been developed to make gene delivery safer and more efficient. Several therapeutic strategies have evolved, including gene-based (tumor suppressor genes, suicide genes, antiangiogenic genes, cytokine and oxidative stress-based genes) and RNA-based (antisense oligonucleotides and RNA interference) approaches. In addition, immune response-based strategies (dendritic cell- and T cell-based therapy) are also under investigation in tumor gene therapy. This review highlights the progress and recent developments in gene delivery systems, therapeutic strategies, and possible clinical directions for gene therapy.

This paper explores similarities and differences in the application of positive and negative politeness strategies to English and Chinese business letters and illuminates underlying causes of such similarities and differences.The results indicate that English and Chinese business letters have some common features and great discrepancies in categories and the distribution of positive and negative politeness strategies.It is argued that common situational factors,different cultural backgrounds and different syntactic features result in their similarities and differences.

This paper explores similarities and differences in the application of positive and negative politeness strategies to Eng-lish and Chinese business letters and illuminates underlying causes of such similarities and differences. The results indicate that English and Chinese business letters have some common features and great discrepancies in categories and the distribution of posi-tive and negative politeness strategies. It is argued that common situational factors, different cultural backgrounds and different syntactic features result in their similarities and differences.

The subprime mortgage crisis and the resultant inflationary monetary policy in the USAhave left the Chinese economy subject to four risks in particular.First,China's exports tothe USA might continue to decline.Second,in the medium term,the higher US inflation ratewill lead to a weak dollar,which will negatively affect China's exports.Third,in the longterm,when the US Federal Reserve decreases money supply to control inflation,the USeconomy might enter another recession,hurting China's exports further.Fourth,China'sforeign exchange reserve assets might suffer heavy losses when the US inflation rate rises.Conventional foreign exchange investment strategies are insufficient for dealing with thesefour risks.Investment by China in the major US banks is suggested in the present paper.This strategy would mitigate if not eliminate all four risks.China could gain considerablefinancial returns on investments with only moderate risk.

or US banks is suggested in the present paper. This strategy would mitigate if not eliminate all four risks. China could gain considerable financial returns on investments with only moderate risk.

树型网络的相似性度量方法在信息检索、数据挖掘等众多领域应用广泛。针对现有研究成果进行比较研究，在将树型网络划分为有序树和无序树的基础上，进一步将有序树的相似性度量方法归纳为基于操作策略(operating strategy)、基于分解策略(decomposition strategy)、基于路径比较(path comparison)、基于节点比较(node comparison)四大类；将无序树的相似性度量方法归纳为双边匹配(bilateral matching)法、最大公共子树(largest public subtree)法两大类；对于上述每类相似性度量方法，通过分析相关经典算法及后续优化算法，总结了各类相似性度量方法的处理对象、原理、优缺点、适用范围、领域应用要求及适用原因。最后探讨了本领域的未来研究方向。

Similarity measures of tree based network are widely used in various areas such as information retrieval and data mining. A comparative study was done based on current research achievements of similarity measures of tree based network. Firstly we classified tree based network into two types, i.e. ordered tree and unordered tree. And then the similarity measures of ordered tree were classified into four categories, including operating strategy based, decomposition strategy based, path comparison based and node comparison based methods;meanwhile, the similarity measures of unordered tree were classified into two categories, including bilateral matching method and largest public subtree method. According to the abovementioned similarity measures, related classic algorithms and subsequent optimized algorithms were reviewed detailedly. Furthermore, the processing objects, principles, advantages, disadvantages, applicable scopes, requirements and reasons of these algorithms were su