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1、5 大自然的语言,冬至九九歌 一九二九不出手 三九四九冰上走 五九六九沿河看柳 七九河开八九雁来 九九加一九 耕牛遍地走,1.了解物候学的有关知识，理清文章的说明顺序。(重点) 2.体会课文准确严谨、生动形象的语言，分析文中的说明方法及其作用。(难点) 3.激发热爱科学、探索科学奥秘的兴趣，培养注重观察、讲究实证的科学态度。(重点),竺可桢（18901974），字藕舫，浙江上虞人。中国科学院院士，中国近代气象学家、地理学家、教育家。他是中国近代地理学和气象学的奠基者，是中国物候学的创始人。主要著作有物候学中国近五千年来气候变迁的初步研究等。,状元成才路,状元成才路,状元成才路,状元成才路,状元
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4、簌（ ） 物候（ ） 农谚（ ） 连翘（ ） 悬殊（ ） 纬度（ ） 经度（ ） 销声匿迹（ ）,pin,zi,yn,yn,hu,sh,s,yn,qio,wi,n,jn,词语解释,孕育：怀胎生育，比喻既存的事物中酝酿着新事物。 销声匿迹：本义是不再公开讲话，不再公开露面。这里指昆虫无声无息、无影无踪。 衰草连天：很多草枯黄败落的样子。 载途：满路，有遍地的意思。 周而复始：一次又一次地循环。 草长莺飞：形容春天美好的情景。,（13） 什么是物候和物候学。 （45） 物候观察对农业的意义。 （610） 物候现象来临的决定因素。 （1112） 物候观测研究的意义。,文章结构,默读第一部分，回答下列
5、问题：,什么叫物候？什么叫物候学？,草木枯荣、候鸟来去等自然现象，古代劳动人民称之为物候。 利用物候知识来研究农业生产的科学，叫物候学。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成
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7、才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,朗读第一段，想一想：这一段主要描写了什么内容？按照什么顺序来描写的？,以优美生动的写景笔调描写了一年四季丰富的物候现象，给读者展现了一幅四季风景画。本段是按照四季的时间顺序来写的。表示时间的词语有“立春过后”“再过两个月”“不久”“于是转入”“到了秋天”“准备迎接”等，条理清晰。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,
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12、、桃花、布谷鸟三个例子时采用了什么修辞方法？有什么样的表达效果？,拟人。形象生动地写活了大自然中无比丰富的物候现象。增强了文章的生动性和可读性。,默读第二部分，回答问题：,物候观测对农业有什么重要意义？,物候观测的数据反映气温、湿度等气候条件的综合，也反映气候条件对于生物的影响，比较简便，容易掌握。可以广泛地运用在农业生产上。,物候观测使用的是“活的仪器”，是活生生的生物。它比气象仪器复杂得多，灵敏得多。,这两句运用了什么说明方法？有怎样的作用？,作比较。说明了物候观测的重要特征是使用活生生的生物进行观测，并且这种观测要更复杂、更灵敏。,朗读句子，说一说：,状元成才路,状元成才路,状元成才路,
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15、临的因素有哪些？,南京桃花盛开时,北京桃花含苞待放,纬度对物候的影响 （三四月间）,快速浏览第三部分，指出决定物候现象来临的因素有哪些？,经度对物候的影响,济南苹果树四月中或谷雨节开花,烟台苹果树开花要到立夏,高下的差异对物候的影响,山顶和山下的差异,古今差异对物候的影响,根据英国南部物候的一种长期记录，拿1741到1750年十年平均的春初七种乔木抽青和开花日期同1921到1930年十年的平均值相比较，可以看出后者比前者早九天。就是说，春天提前九天。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,
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