Hi,
订阅
报纸
纸质报纸 电子报纸
手机订阅 微商城
英语
学习
双语学习 热点翻译 英语视频
实用英语 报纸听力 图书推荐
教育
信息
最新动态 活动预告
备课资源 语言文化
演讲
比赛
精彩演讲
活动动态
用报
专区
高中   初中
小学   画刊
教案 课件 学案考试指导
高中    高一    高二    高三     |     初中    初一    初二    初三     |     小学         |     画刊    
高一教案 第825期(2)
发布时间:2021-03-29

本期配套教案共2页:  1  2

Teeth to the past (P6)
吉林毓文中学 赵莹

I. Lead in
•    What is the name of the animal?
•    What do you know about it?

II. Read for general information
Read the article quickly to get the main idea.
    Scientists have retrieved the oldest DNA on record within the teeth of ancient mammoths in Siberia, Russia, from over one million years ago. 

III. Read for details 
Read and divide the article into two parts and summarize the main idea. 
 

III. Read for details 
Read part one and answer the following questions. 
1. Where did the previous DNA sequence come from? 
   Previously, the oldest DNA sequence was from a horse in Canadian Yukon territory about 700,000 years ago.

2. What is the importance of retrieving the DNA from these mammoths according to Tom van der Valk? 
   He said, “Breaking this somewhat magical barrier of more than one million years old opens a new time window, so to say, and evolutionary perspective.”

 

3. How did scientists previously study prehistoric creatures? 
 By studying fossils.

4. What do the three DNA samples show? 
•    The Krestovka mammoth was found to have diverged from the ancestors that led to the famous woolly mammoth more than two million years ago. The DNA also shows that woolly mammoths’ adaptations to the cold weather were already present in earlier mammoth populations. 

5. What do the last two paragraphs tell us?
The significance of the study. 

IV. Language study 
•    记录在案           on record
•    解锁遗传因物质     unlock the genetic material
•    打开新窗口              open a new window
•    开创新局面          break new ground
•    一些特征          a handful of characteristics
•    数以万计         tens of thousands of 

2. Although the samples (样本) from the mammoths – ancestors of elephants and one of the largest Ice Age mammals – were found in the 1970s, new scientific methods were required to unlock the genetic material. 
What does this sentence tell us?
把本句拆分成简单句,学习本句如何把短句写成长难句的技巧

1)    The samples are from the mammoths. 
2)     The mammoths are ancestors of elephants and one of the largest Ice Age mammals.  
3)     The samples were found in the 1970s. 
4)     Scientists had to find new scientific methods to unlock the genetic material. 
释义:虽然从猛犸象——大象的祖先和冰河时代最大的哺乳动物之一——身上提取的样本是在 20 世纪 70 年代被发现的,但需要新的科学方法来解开这些遗传物质的谜团。 

 


 

本期配套教案共2页:  1  2

Most Popular

 

 
热点翻译


 

标题
内容
关闭
内容
联系我们   |    诚聘英才   |   演讲比赛   |   关于我们   |   手机访问
英文二十一世纪(北京)教育传媒发展中心版权所有,未经书面授权,禁止转载或建立镜像。
主办单位:中国日报社 Copyright by 21st Century English Education Media All Rights Reserved 版权所有 复制必究
网站信息网络传播视听节目许可证0108263   京ICP备13028878号-12   京公网安备 11010502033664号