1、The Study of Living Thing,Lesson 28:,I. Learning aims:,Master the new words: biology, butterfly, migrate, fantastic, completely, grandchild, female, milkweed, chemical, puzzling,II. Learning important and difficult points:,both and,biology butterfly migrate fantastic completely grandchild female mil
2、kweed chemical puzzling,New Words,What do you do?,1.Put eight spoonfuls of cornstarch into the bowl. 2.Add four to five spoonfuls of water. 3.Mix the cornstarch and water together. 4.Pour the mud into your hand. 5.Open and close your hand.,mix,What is happening?,Some things dissolve in water. Sugar
3、dissolves in water. Salt dissolves in water. But not cornstarch. It only mixes with water. When you close your hand and press, some of the water gets out. The mud becomes solid. When you open your hand, the water mixes in again. Now it is a liquid!,What else can you do?,Put some of the mud in a bowl
4、. Now hit the mud with your open hand. What happens? Now do the same thing with water. Are the mud and water the same when you hit them?,Language Points,作形容词，意为“奇异的、极好的、了不起的”，在句中作定语或表语。如：,fantastic,I think this is a fantastic invention. 我想这是一个了不起的发明。,作可数名词，意为“化学物质、化学制品”，复数形式是chemicals。如：,There are n
5、o chemicals in this kind of food. 这种食品中没有化学物质。,2. chemical,作形容词，意为“化学的、化学作用的”，在句中作表语或定语。如：,We can find chemical additives in many foods. 我们在很多食品中发现了化学添加剂。,句中的have been drawing 是现在完成进行时，它由“助动词 have (has) + been + 现在分词”构成，当主语是第三人称单数时用助动词has，其他情况用助动词have。现在完成进行时主要表示从过去开始一直持续到现在的动作，这个动作是否延续下去，要根据上下文而定。,
6、3. Fantastic facts about the butterfly have been drawing Dr. Taylors attention.,它往往与表示一段时间的时间状语连用，如：all the time, this month, all day, these few days, for a year, since a week ago等。,She has been playing basketball after school this week. 这个星期她放学后一直打篮球。 Tony has been drawing in his bedroom all the af
7、ternoon. 托尼在卧室画了一下午。,连词bothand的意思是“和都，既也”，它可以连接句中句子成分相同的词语，如果用它连接主语时，谓语动词要用复数形式。,Both Li Ping and her mother take exercise every morning. 李萍和她妈妈每天早晨都进行锻炼。,4. This is both puzzling and interesting for many scientists.,Exercises,1. They gave us some good _ (suggest) on our work. 2. In order to get bet
8、ter _ (educate), she went to study in Beijing. 3. Who is the _ (design) of this new machine? 4. He was _ (complete) wrong this time. 5. My mother took some _ (freeze) meat from the fridge.,frozen,I.用括号中所给词语的适当形式填空。,suggestions,education,designer,completely,1. The teacher told me to pat attention _ m
9、y pronunciation. 2. We are getting ready _ the work. Can we start now? 3. Dr. Lee is interested _ studying the life of butterflies. 4. I found a lot of useful information after looking _ the Internet. 5. You must put more effort _ your work if you want to succeed.,into,II.用适当的介词填空。,to,for,in,on,Homework,Preview the next lesson.,