To Question or not to Question, That is the Question

The importance of classroom interaction in language learning is self-evident. Among the various kinds of interactions, teacher questioning and student answering is an important aspect. This paper, on the basis of background knowledge of classroom questioning and the empirical study, first discuss the results of the experiment and the reasons, then put forward some useful techniques and principles in classroom questioning. At last the author got the conclusion: Effective use of questioning is a critical asset in every good teacher's toolbox. A good teacher uses questions at the right level and follows good questioning techniques. Key words: questioning, technique, EFL class Résumé: L’importance de l’interaction de classe dans l’apprentissage de la langue est évidente. Parmi les diverses sortes d’interations, l’enseignant questionnant et l’apprenant répondant est un aspect important. Cet essai, sur la base des connaissances contextuelles de la question en classe et l’étude empirique, discute d’abord les résultats de l’expérimentation et les raisons, puis propose des techniques et principes utiles de la question en classe. Enfin, l’auteur tire la conclusion : l’utilisation effective de la question est un capital critique pour chaque bon enseignant. Un bon professeur utilise les questions au niveau approprié et suit de bonnes techniques de la question. Mots-Clés: question, technique, classe ALE(Anglais Langue Etrangère

Understanding the internal structures of the X(4140)X(4140), X(4274)X(4274), X(4500)X(4500) and X(4700)X(4700)

We investigate the newly observed $X(4500)$ and $X(4700)$ based on the diquark-antidiquark configuration within the framework of QCD sum rules. Both of them may be interpreted as the $D$-wave $cs\bar{c}\bar{s}$ tetraquark states of $J^P = 0^+$, but with opposite color structures, which is remarkably similar to the result obtained in Ref.~\cite{Chen:2010ze} that the $X(4140)$ and $X(4274)$ can be both interpreted as the $S$-wave $cs\bar{c}\bar{s}$ tetraquark states of $J^P = 1^+$, also with opposite color structures. However, the extracted masses and these suggested assignments to these $X$ states do depend on these running quark masses where m_s (2 \mbox{ GeV}) = 95 \pm 5 MeV and $m_c (m_c) = 1.23 \pm 0.09$ GeV. As a byproduct, the masses of the hidden-bottom partner states of the $X(4500)$ and $X(4700)$ are extracted to be both around 10.64 GeV, which can be searched for in the $\Upsilon \phi$ invariant mass distribution.Comment: 6 pages, 4 figures. Accepted by Eur. Phys. J.