Unit 4 Green worlds教案

Pre-reading

In SB1(下) Unit19, we have learned some knowledge about agriculture. And we have known about one of the greatest scientists in our history-Jia Sixie.

Did you remember? How do we plant crops?

We should plant rice in a field one year and wheat in the field next year.

How do we plough?

Plough deep the first time and less deep the second time.

In this unit, we will learn about scientists who are important to the history of botany and agriculture.

This word “botany”植物學(xué),is a word about plants. As we all know, there are many plants around us, such as wheat, corn, tomato, apple trees etc. Without these plants, we can’t live. But how much do you know about them? Who can tell us something about them.

Student A Wheat is a kind of plant that can be make into bread, some delicious cakes which can make us full.

Student B Apple trees can produce apples that can provide us vitamins which can keep our bodies fit.

Yes, these plants are very useful, but how do we plant them? Where are they from?

It is a kind of very careful work to plant the crops and trees. At first, they are wild plants.

Reading

Now let’s look at the text-The birth of a science.

Post-reading

Read then do exercise 1 in post-reading.

(1) Keys:1D2D3B4A5C

(2) Questions

1 How did scientists classify plants before Linnaeus?

They classified plants into herbs and trees, or according to the shape of the fruit, or whether they bad flowers or not.

2 How did Linnaeus classify plants?

He classified plants according to the arrangement of the male and female organs in the flowers.

3 What relationship between Linnaeus and Joseph Banks?

Joseph Banks is the friend of Linnaeus’s student Daniel Solander’s.

4 When did the expedition to Tahiti start?

In 1768.

5 What were the goals of James Cook’s first voyage around the world?

There are three goals. Page31, Paragraph 4.

6 Why did Joseph Banks have to supply his own money to equip part of the expedition?

Because he wanted to do some researches that the British government didn’t pay for it.

Introduce some words and phrases.

botany 植物學(xué)classify分類，歸類 herb草本植物 unique獨一無二的，獨特的 conquer征服 privilege特權(quán) cosy安逸的 appetite欲望，愛好 despite盡管 expedition遠(yuǎn)征，探險 expenses 經(jīng)費undertake 從事enterprise事業(yè) accumulate 積累abandon 遺棄breakthrough突破

based on 以――為依據(jù)的at first sight乍一看（之下） search for尋找 on a large scale大規(guī)模地 be involved in被牽連進去――；陷入――

Page32 Language study exercise 2

Keys(1)group (2)female (3)Herbs (4)was appointed (5)botanical (6)was abandoned (7)globe (8)Oceania (9)enterprises (10)expense.