Abstract. For the problems exit in today's Chinese Linguistics and Literatures teaching such as ignorance to the students' humanistic quality cultivation, ineffective teaching and the lack of effectiveness teaching evaluation system, this essay present the necessity of optimizing the teaching under new curriculum and put forward new methods to perfect its teaching mode, namely to explore the class teaching efficiency, strengthen the humanistic quality cultivation and emphasize the teaching evaluation system developing.China's new round of curriculum reform has deeply changed the mode of basic education. Chinese Linguistics and Literatures, an important component of Chinese teaching, which play a significant r ole in students' humanistic quality and comprehensive abilities developing, undergone magnificent changes in teaching mode under the new curriculum reform. The imperfect teaching mode confronts lots of problems and challenges in the reforming background, how to optimize really counts.
This paper identifies a dilemma in the relationship between R^2 and price efficiency: After comprehensively studying the R^2 change around 7 well-known corporate events, neither the traditional understanding of R^2 as price inefficiency, nor the behavioral way of R^2 as price efficiency can explain the observed R^2 change around the events. We adopt an alternative methodology to replace the standard difference-in-difference regression and directly decompose the R^2 change. We find that, due to the endogeneity of events, the changes of R^2 are over-estimated. We further propose that in the event study setting, the R^2 change may be simply the consequence of the inflow/outflow of some trend-chasing investors, and it may be detached from price (in) efficiency. Empirical evidences are consistent with this hypothesis.
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