话题5介绍科学实验或探讨生命科学相关知识-2025-2026学年英语期末写作复习九年级全册（冀教版）

初中英语写作专项突破 (冀教版初三) 写作话题精讲·词汇句型·范文示范 写作话题5：介绍科学实验或探讨生命科学相关知识 适用年级： 初三 对应版本： 冀教版 常考题目： A Science Experiment Life Science 一、 话题解读 本话题是冀教版初三写作的重点。常以介绍科学实验过程、探讨生命科学现象等为题，考察 学生用英语描述实验步骤、解释科学原理及表达科学观点的能力，在单元测试、期中期末和 中考书面表达中出现频率较高。 二、核心词汇与短语 1.核心难点词汇： 1.hypothesis /haI'pp6asIs/n.假设 2.experiment /Ik'sperIment/n.实验 3.observation/pbze'veI[n/n.观察 4.variable/'veariabl/.n.变量 5.procedure /pre'sid3(r)/n.步骤 6.conclusion/kan'klu:3n/n.结论 7.biology/bar'oled3iln.生物学 8.organism/'3:genIzem/n.有机体 9.cel/sel/n.细胞 10.photosynthesis/feuteu'sIneasIs/n.光合作用 11.respiration/,respe'reIn/n.呼吸作用 12.evolution/ive'lufn/n.进化 2.常用短语： 2 1.control group对照组 2.experimental group实验组 3.dependent variable因变量 4.independent variable自变量 5.data collection数据收集 6.draw a conclusion得出结论 7.in conclusion总之 8.on the other hand另一方面 9.as a result结果 10.take measures采取措施 11.carry out开展 12.in addition此外 三、高级句型模板 1.结构：In order to,we should first...为了…，我们首先应该… In order to test the hypothesis about photosynthesis,we should first prepare two groups of plants. 2.结构：Not only does..affect..,but it also helps..不仅…影响…，还帮助… Not only does light affect photosynthesis,but it also helps plants produce oxygen. 3.结构：It is necessary for us to...when carrying out.开展…时，我们有必要… It is necessary for us to record observations carefully when carrying out a biology experiment. 4.结构：The key difference between..and..is that..…和…的主要区别是… The key difference between the control group and the experimental group is that the latter lacks light. 5.结构：Compared with.,can better show..与…相比，…能更好地展示… Compared with simple descriptions,data collection can better show the results of the experiment. 6.结构：Vhat makes...interesting is that.使…有趣的是… What makes studying cells interesting is that they are the basic unitso all organisms. 7.结构：Althoug h.,we can still..…by..尽管…，我们仍然可以通过…来… Although evolution is a slow process,we can still learn about it by ob- serving different species. 四、满分范文示范 A Science Experiment on Photosynthesis In the field of biology,photosynthesis is a crucial process for all green plants.Last week,our class carried out an interesting experiment to test how light affects this process. In order to test our hypothesis that light is necessary for photosynthesis,we first prepared two groups of similar plants.The control group was placed in a sunny area while the experimental group was kept in a dark room.The independent variable here was light,and the dependent variable was the production of starch,which indicates photosynthe- sis.During the procedure,we watered both groups regularly and recorded our observations daily.After a week,we took a leaf from each group and tested them with iodine solution. As a result,the leaf from the control group turned blue,showing starch was present,but the one from the experimental group did not. What makes this experiment interesting is that it clearly shows the importance of light. Not only does light affect photosynthesis,but it also helps plants grow healthily.The key difference between the two groups was the presence of light,which led to different results.Compared with just reading about photosynthesis in books,doing the exper- iment ourselves helped us understand the concept better. It is necessary for us to follow scientific steps when carrying out experiments.In addition to careful observation,data collection is also very important.Although this was a simple experiment,it taught us a lot about how plants make food.In conclusion,science experiments are a great way to learn about the world of organisms around us.