冀教版九年级英语下册Lesson10

Lesson 10

What is DNA?

Fill in each blank with the proper word from the brackets:

1. What is ___________(big) animal in the world? the biggest2. These oranges are __________(juice). Please have some. juicy 3. A horse is a __________(help) animal. helpful

4. Look! My computer doesn’t work. I need __________ to repair (repair) it. Does your computer need _____________________ repairing/to be repaired (repair)? 5. – Would you mind __________(open) the door for me? opening -- No, not all. I have made up my mind to ______(help) you. help 6. The boy ________(call) Mike was once a thief, but now calledhe __________(call) “living Lei Feng”. is called

根据汉语意思完成句子，每空一词：

1. 我们都叫他小李。We all _________ _________ Xiao Li. call him 2. 昨天晚上我和父亲同时到家。 My father and I got home _____ ______ at the _____ same _______ time yesterday evening.

3. 这个动物的耳朵像兔子的耳朵。The animal’s ears ________ the rabbit’s. are/look _________ like 4. 他们把不同的零件放在一起。 They _________ these different parts __________. put together 5. 我可能会把恐龙和兔子结合起来。

and I might _________ a rabbit. combine a dinosaur _________

Think about it! 1. Do you and the students near you look the same? What is the same? Are there differences between you and them? 2. What you know “DNA”? What can scientists do with “DNA”? “DNA” is short for deoxyribonucleic acid.[di:' ksi,raib unju:'kli:ik] ['æsid]

DNA is a pattern for your body to build itself.(like a blueprint)

The two girls are twins. Maybe they have the identical DNA.

Zhang Liangying looks like her mother

Identical twins are two children that grew from the same egg. They have identical DNA. They’re clones!

Let’s learn the new words蓝图 n. 一般意义上的 adj. 完全相同的 adj. 双胞胎之一 n. 卵细胞 n. 克隆 v,n. 确认，鉴别 v. 不但……而且…… blueprint generally indentical twin egg clone identify not only…but also…

Listen to the tape and answer”T” or “F”1. DNA is the pattern for our body uses to build itself. 2. Each living things has its own, unique DNA. 3. From your DNA , scientists can identify you and people related to you. 4. Our bones do not have the same DNA as our skin. 5. All health problems come from our family’s DNA.

Language notes Are there differences between you and them? 你和他们之间有什么不同吗? 【辨析】:between与among between常用于两者之间，among一般指三 者或三者以上，如果指三个以上的人或物的 每两个之间时，仍然要用between。 Switzerland lies between France, Italy, Australia and Germany. 瑞士位于法国，意 大利，奥地利及德国之间。 They live among the mountains. 他们住在 群山之中。 I was among the crowd. 我处在人群中。

You use it to build a house.你用它来建造房子。 use的用法 use…to do sth. 用……做某事 He is using a knife to cut bread. =He is using a knife for cutting bread. 他正用小刀切面包。 Use your eyes to look and don’t use your hands to touch. 用眼睛看而不用手摸。 It is no use doing (to do). 做……是无用的(无益的) 【注意】 use的名词和动词同形，但要注意两者的读音/ju:z/是动 词的读音，而/ju:s/是名词的读音。useful是形容词，它 是由名词use加后缀-ful构成的。如： What’s the use of this? 这个有什么用途？ Is the fridge very useful? 这台冰箱很有用吗？

DNA is a pattern, too. DNA也是一种模型。 too也 too表示“也”时通常置于句末，其前用逗 号，其后用句号。如： I have seen the film, too. 我也看过那部电 影。 【辨析】:too与either too与either都表示“也”,其区别是too用 于肯定句，表示“也”;either用于否定句， 表示“也不”。他们通常都位于句末，其 前用逗号隔开。如： He has a sister, too. 他也有个小妹妹。 He doesn’t have a knife, either. 他也没有 小刀。

Except for identical twins, each living thing has its own unique DAN. 除了每个双胞胎之外，每个 生物都有他唯一的DNA。 1)except for除……以外，只是 He is a good ma except for hot temper. 除了脾气暴躁外，他是个 好人。 Your article is quite good except for several spelling mistakes. 你的 文章很好，只是有几处拼写错误。 2)【辨析】:every与each

every与each都可与单数名词连用，且 意义相近，表示“每个”,然而every 与each并不完全一样，every强调整体 概念，each则表示个体概念。 如果不特别强调某一意义时，every和 each可以互换。如： We want every child to succeed. 我们 希望每个孩子都成功。 Each child will find his own road to success. 每个孩子都会找到他个人的 成功之路。

each可以指两个或两个以上的人或东 西，every却不能指两个，只能指三个 以上的数量。如： Each side of the road has some trees. 街道两边有许多树。(不能说every side) 另外，如有其它限定词同时修饰中心 词，each可作代词用each of的形式， 而every则只能用限定词。如： Each of my parents gave me presents for Christmas. 过圣诞节是我 父母每人都给了我礼物。