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1、Unit 5 Look into Science教学目标单词卡片 名词： experiment, jar, upside, method, raincoat, force, pressure, holder, lighter, match, oxygen, telescope, double, mystery, biology, butterfly, grandchild, female, milkweed, chemical, blueprint, twin, pattern, grandson, granddaughter, instruction, development, mobile
2、 phone, discovery 动词： pour, force, conclude, match, examine, migrate, repeat, identify, affect, suggest形容词： correct, scientific, shallow, solar, double, fantastic, puzzling, general, complex, related 副词： double, certainly, completely 连词： unless短语归纳动词短语： turnupside down, pour out, takeoff, use up, be
3、 made up of, turnover, push up, push down, draw ones attention名词短语： scientific method, solar system 副词短语： even if 形容词短语： in general, be related to 介词短语： except for, in place 数词短语： billions of句型荟萃1.I am so sure of my theory that Brian can do the experiment over your head and I know you wont get wet.2
4、It is strong enough to hold the water.3I dont think you can find one unless you have a bigger telescope.4In Mexico, the butterflies always return to the same small piece of forest, which is only 20 kilometres wide. 5But in Mexico, people cut down the trees that the butterflies need to rest on6In gen
5、eral, a blueprint is a drawing that shows how to put a house together with many different parts.7It takes millions of years for nature to change the DNA in living things to make them fit the world they live in.8All these things are strongly influenced by your DNA before you are born!9Except for some
6、 twins, every living thing has its own unique DNA.10From your DNA, scientists can identify not only you, but also people who are related to you.11Scientific discoveries are making our lives better and better.重难分析1.在充分理解课文内容的基础上掌握重点词汇和短语的用法，本单元主要讲的语法是定语从句，同时穿插宾语从句、条件状语从句、时间状语从句等。2在学习交际用语和阅读中正确掌握定语从句连
7、接词的用法，提高学生综合运用语言的能力。突破建议1.为了便于学生理解，课堂上教师要逐层分析句子结构，引导学生先分析稍微简单的句子结构，找出主要成分及附加成分，分清定语从句所修饰限定的先行词，通过实例对比辨别引导词在定语从句中所作的成分，帮助学生分析确定引导词。2根据实际情况，让学生重现课文内容，培养学生热爱科学的态度。教材解读本单元的主要话题是“研究科学”，第25课通过做实验总结出大气会产生压力的结论，第26课通过蜡烛的燃烧总结出空气中氧气的含量占五分之一，第27课讲述了研究太阳系，第28课是生物研究，研究一种蝴蝶的生活习性和现状，第29课是对有关DNA知识的讲解，第30课是前几课科学研究的总
8、结。在本单元中始终有定语从句在课文中出现，教师课上要就这一语法点进行适当拓展讲解。What do you have in common with a banana? Even though we might not look alike, all living thingsbananas and people includedare made up of the same basic material.Just like houses are made up of smaller units such as bricks, all living things are made up of tr
9、illions of microscopic(微观的) building blocks called cells. Within an organism, each cell contains a complete set of “blueprint”. These directions determine the organisms characteristics.If we could zoom in(放大) on a single, tiny cell, we could see a “container” inside called a nucleus(细胞核). It holds a
10、 stringy substance called DNA, which is like a set of blueprints, or instructions. DNA contains a code for how to build a lifeform and put together the features that make the organism unique. Segments, or pieces, of DNA are called “genes”. In living things, such as us, each gene determines something
11、 about our bodiesa trait. In our DNA, there are genes that are responsible for hair colour, eye colour, ear lobe shape and so on. We get our DNA from our parents. Some characteristics, like eye colour, are pretty much entirely determined by DNA.Some are determined both by DNA and by your environment
12、 as you grow up, like how tall you will be as an adult. And some traits are not very directly tied to DNA at all, like the kind of books you like to read.Just like us, banana plants have genes and DNA in their cells, and their DNA determines their traits, although we cant see a single cell or the DNA inside of it. If we remove DNA from millions of cells, however, we will be able to view it without a microscope. That is what we will do today! 3