新课改提倡自主学习,合作学习,探究学习,但并非所有的内容都要合作学习,应该注意合理的选择。1.对于一些规律性强,涵盖面广,迁移和应用范围大的定理、公式和一些数学思想方法,可以开展合作学习。 2.选择具有挑战性的问题。有些问题对于个人而言较难独立完成,但又是在学生力所能及的范围内,这样的问题学生会产生强烈的合作探索的愿望,在合作中大家共同分析问题、相互交流,教师作适当的指导,使得问题变得越来越清晰,这样相对于个人独立解决问题变得容易且深刻。例如:在讲授完《平行四边形的判定》后,出示这样一道例题:已知四边形ABCD,在以下条件下:1.∠A=∠C,2.∠B=∠D,3.AB//CD,4.AB=CD,5.AC//BD, 6.AC//BD 中任选二个条件,问哪些能得出四边形ABCD是平行四边形?哪些不能?并举反例说明。本例若让学生独立完成很有可能考虑不全而丢失一些结论,这时让学生互相讨论、交流、猜想、论证,可使学生在探究过程中积极参与,并能相互促进,共同提高,大大了提高学习的效果。合作学习旨在活跃学生思维,拓展思维强度,使学生能从那些与自己不同的观点和方法中得到启发,对问题的理解更加丰富和全面,从而促进思维向广度和深度发展,切实提高课堂教学效率。
诚然合作是一种品质,需要教师耐心地培养和长期地训练;合作学习是一种形式,需要教师优质地组织和高效的实施。惟有这样,才能使课堂呈现出真正意义下的合作学习,才能使课堂焕发出生命的活力。更加有效率的提高教学质量。
Dear Mr.Smith,
I am indeed very sorry that I missed the examination on International Business English Writing you gave last Friday. I feel awful about it and want you to know what happened that day.
I suddenly fell sick early that morning and my parents had to send me to the hospital.Please find enclosed a copy of the medical bill.
I sincerely hope you can understand my situation and accept my apology. I would appreciate your allowing me to take a make-up examination. I will come to your office during your office hour on Monday to discuss this possibility with you. Once again, I apologize for any inconvenience caused.
Sincerelyyours,
Wang Hua
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