j died out=ceased to exist .Aliving thing dies,but a group of living things dies out when there are no more of them.
k prairie dog： common name given in the US to the ground squirrel, which is also found in Africa and Eurasia. Other common names are chipmunks and gophers. Ground squirrels are between 20and 80 cm long and are usually colouredgreyish. They may live in burrows in the ground or may shelter in hollow logs or trees.
Step 5 Comprehension
SB Page 4, Part 2.Get Ss to work through this exercise in pairs, then check the answers with the whole class.
1 F The first settlers were Native Americans who lived by hunting animals and gathering food.
2 F The first horses were brought to America by the Spanish.
3 T
4 F They were forced to move away.
5 T
6 T
7 F Native Americans made use of the whole animal when they killed it, but later settlers took only the skins of the bison.8 T
Step 6 Reading aloud
Speech Cassette Lesson 50. Play the tape of the passage for the Ss to listen and follow. Play the tape of part of the passage once more; this time the Ss listen and repeat. A suitable section might be the paragraph “The killing of the bison …” to practise intonation and the sentence stress of longer sentences.
Step 7 Reference
SB Page 4, Part 4. Get Ss to do this exercise individually or in pairs, then check the answers with the class.
Answers：
1 they arrived …America
2 wild horses
3 Native Americans
4 bison's
5 the settlers' own plains
6 Native Americans'
《The USA(第4页)》出自：www.89xue.com网www.89xue.com
7 agreements
8 The settlers
9 the soil
10 the prairie dog
11 There was less food …for the prairie dog.
12 a change in the number of bison
Step 8 Workbook
Wb Lesson 50, Exx. 2-3.
Before doing Ex. 2, Ss should read the last paragraph of the reading passage again. Ask them to find out the first sentence (Millions of bison were killed by settlers). Then pairwork. Check the answers with the whole class by calling out individual Ss to do the exercise. Ex. 3 can be done orally in groups or pairs. Check the answers in class. Get the Ss to write it down in their exercise books.
Step 9 Consolidation
SB Page 4, Part 3. This can, if preferred, be done as homework, when Ss read the text again.The final diagram should look like this：
Ask Ss what they have learnt about bison and the plains of America in this lesson, especially anything that was new for them.
Homework
Read the passage again and complete the diagram in Part 3, if this was not done in class.
Finish off the Workbook exercises.
Lesson 51教学设计方案
Step 1 Revision
1 Check the homework exercises.
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