文档介绍：Unit 2 Cloning
Language points
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1. clone n. [c] 克隆
vt. 克隆
(1) Dolly the sheep is a _______.
(2) _______ plants is straightforward.
(3) Dolly is a ______ sheep.
clone
Cloning
cloned
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2. In pairs, look at these pictures and discuss which ones are natural clones and which ones are man-made. Explain how they differ.
differ vi. 不一致, 不同, 相异
sb differ from/ with sb on/ about / over /upon sth
某人与某人在....方面意见不同
A and B differ in …
某物与某物在....方面不同
A differs from B
某物与某物不同
difference , 差别, 分歧, 争论, 差额
different
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即时练****br/>用介词 from, with, on, about, upon 或 in 填空。
(1) We differ _________ him _________ _____ that question.
from/with
on/about/
upon
(2) The two nations differ __ culture
and religion.
(3) The climate here differ _________
that of the South.
in
from/with
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3. It is a way of making an exact copy of another animal and plant.
exact adj. 确切的，精确的
I want to know the exact time.
exactly ，正是；恰好
他们的回答完全一样。
Their answers are exactly the same.
那正是我所期待的。
That's exactly what I expected.
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4. It also happens in animals when twins identical in sex and appearance are …
identical adj. ①完全相同的 (常与with / to连用) ②同一的, 同样的
These two designs are almost identical.
My opinion is identical with his.
This picture is identical to the one my mother has .
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5. Firstly, gardeners use it all the time to produce commercial quantities of plants.
commercial adj.
①商业的, 贸易的 ②商务的 ③以获利为目的的，从营利角度出发的
a commercial loan /activity
商业贷款/活动
He is doing a commercial course at the local college.
他在本地学院学商业课程。
The play was a commercial success.
这出戏从营利角度看很成功。
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6. undertake vt. (undertook; undertaken)
The procedure is difficult to undertake, of course.
The scientist undertakes the experiment.
I can undertake the responsibility for the changes.
The lawyer undertook a new case.
undertake vt 着手做, 实施，从事, 承担
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(1) He will _________ __ _______ next m