笔者现对苏教版初中生物教材的3个实验进行改进,以提高生物实验教学的有效性。一、观察人的口腔上皮细胞实验教材提示取口腔上皮细胞的部位是在口腔内侧壁上轻轻刮一下,制成临时玻片,用稀碘液进行染色,让学生在显微镜下进行观察,结果在显微镜下观察 The author is now the Supiao version of junior high school biology textbook 3 experiments to improve, in order to improve the effectiveness of biological experiment teaching. First, the observation of human oral epithelial cells suggest that the experimental site to take oral epithelial cells in the oral cavity wall scraping gently, made of a temporary slide, with dilute iodine staining for students to observe under the microscope, the results Observed under a microscope