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《耳朵的科学》一课教学重点与难点有三:1.耳朵的构造(中耳、内耳)。2.耳朵是怎样听到声音的。3.怎样保护耳朵。为了达到本课的教学目的,排除本课的难点,在讲述耳朵的构造时首先使用幻灯投影,将课文中的图形投影到银幕上,由于投影使图形放大,学生就能清晰地看清耳朵的各个部份,特别是中耳与内耳部份。继而,为了使学生了解“鼓膜的构造及形状”时,出示橡胶制的“耳朵模型”。使学生认识到鼓膜是一块圆型的薄膜,鼓膜后面紧贴着三块听小骨。在讲述“耳朵是怎样听到声音”时,声波使
“Ear science” lesson teaching focus and difficulties are three: 1. Ear structure (middle ear, inner ear). How does the ear hear the sound? How to protect your ears In order to achieve the teaching objectives of this lesson, to rule out the difficulty of this lesson, first of all, when talking about the structure of the ear, slide projection is used to project the graphic in the text onto the screen. As the projection enlarges the graphic, students can clearly see the ear All parts, especially the middle ear and inner ear part. Then, in order for the student to understand “the structure and shape of the eardrum,” a rubber “ear model” is presented. Make students recognize that the tympanic membrane is a round type of membrane, the eardrum close to three pieces of ossicles. When it comes to “How does the ear hear the sound?”