Unit 5 Lesson 29 DNA—The Story of You 学案（含答案）冀教版九年级全一册

Unit 5 Lesson 29 DNA—The Story of You
【学习目标】
1.通过基础练习,能记住并正确使用本课时的重点单词和重点短语。
2.通过有效地呈现本课时内容,能够理解课文内容并回答课后的问题。
3.通过小组合作活动,能够用英语向他人介绍自己所知道的有关DNA的知识。
【预习导学】
一、单词速记
1.脱氧核糖核酸　 　
2.蓝图　 　
3.一般的;普遍的　 　
4.复杂的　 　
5.双胞胎之一　 　
6.重复;复述;背诵　 　
7.模式;形式　 　
8.确认;鉴别　 　
9.有关的;相关的　 　
10.孙子;外孙　 　
11.孙女;外孙女　 　
12.指示;说明　 　
二、短语速记
1.in general
2.except for
3.become sick
4.be able to
5.例如
6.和……相同的……
7.与……相关
8.数十亿计的;大量
三、想一想
1.文中介绍了什么是DNA
______________________________________________________________
2.科学家们可以通过你的DNA鉴别什么
______________________________________________________________
【答案】
一、
1.DNA　2.blueprint　3.general　4.complex　5.twin
6.repeat　7.pattern　8.identify　9.related　10.grandson　11.granddaughter　12.instruction
二、
1.一般而言;通常
2.除……之外
3.生病
4.会;能
5.for example
6.the same...as
7.be related to
8.billions of
三、
1.DNA is the blueprint of life.
2.From your DNA, scientists can identify not only you, but also people who are related to you.
【合作探究】
任务驱动一 单词、短语大闯关
1.齐读本课重点单词和短语。
2.用方框内所给单词的适当形式填空。
instruction　twin　repeat　grandson　general
(1)Lucy and Lily are 　 　. They look the same.
(2)Read the 　 　 before using the new phone.
(3)These difficulties are 　 　 among people of his age.
(4)I can't follow you, Tony. Please 　 　 the sentence.
(5)The little boy is Mr. King's 　 　.
3.Show Let's Do It! 2. Fill in the blanks with the phrases in the box.
in general　except for　not only...but also
related to　even if　the same...as
(1)Your homework is quite good 　 　 a few spelling mistakes.
(2)　 　 the young 　 　 the old like pop music.
(3)Kate's hair is 　 　 colour 　 　 her sister's.
(4)　 　, women live longer than men.
(5)　 　 many difficulties remain, we can overcome them.
(6)Is wealth 　 　 happiness
任务驱动二 听力训练
1.Listen to the lesson and fill in the blanks.
(1)　 　 for some twins, every living thing has its own unique DNA.
(2)Some 　 　 problems can be caused by problems in your DNA.
(3)Your finger has the 　 　 DNA as your hair.
(4)From your DNA, 　 　 can identify not only you, but also people who are related to you.
(5)DNA is one of the 　 　 amazing things on the earth!
2.Show Let's Do It! 1. Read the lesson and answer the questions.
3.反复听录音并跟读。熟记课文,掌握文章各段的大意,并借此来复述课文,训练口语表达。
任务驱动三 小组活动
1.Show Let's Do It! 3. Complete the lesson with the sentences in the box.
2.Discussion.
Is it a good idea to change the DNA of the food we eat
Divide the students into two groups.
One group support it is a good idea to change the DNA of the food we eat.
The other group say something about the disadvantages of changing the DNA of the food.
【答案】
任务驱动一
2.(1)twins　(2)instructions　(3)general　(4)repeat
(5)grandson
3.(1)except for
(2)Not only　but also
(3)the same
(4)In General
(5)Even if
(6)related to
任务驱动二
1.(1)Except　(2)health　(3)same　(4)scientists　(5)most
【知识超市】
[命题点]Except for some twins, every living thing has its own unique DNA。除了同卵双胞胎之外, 每个生物都有自己独特的DNA. 　
短语except for意为“除……之外”。如:
The city is good except for the weather. 除天气外,这座城市还不错。
辨析:except for、except、besides和but
except 意为 “除了”, 强调不在其中,指从同类事物的总体中除去一部分
except for 意为 “除了”, 表示对主要部分的肯定以及对局部的否定
besides 意为 “除了……之外(还有)”,后面接名词、代词、或动名词,但不能接从句
but 意为 “除……外”, 强调不在其中,与except可互换,多与no、nobody、who、where、all等连用
对点自测
根据汉语意思完成句子。
1.他是个好人,除了有点脾气坏。
He is a good man 　 　 a bad temper.
2.盒子里除了一张卡片之外什么也没有。
There is nothing 　 　 a card in the box.
3.除了化学之外,Jim还喜欢数学。
Jim likes maths 　 　 chemistry.
【答案】
1.except for　2.but　3.besides
2