Lesson 50

　　1.Teaching Aims:

　　(1) Read and understand the subjects mentioned in the text.

　　(2) Learn the main language points and do some exercises.

　　2. Focal Points:

　　(1) Get the main idea of the text.

　　(2) Learn the usage of:

　　by doing sth; now that; take possession of; object to sth/doing sth; give in / give away / give off / out; have an effect on / have effects on / have no effect on

　　3. Difficult Point:

　　Retell the text and do discussion.

　　4. Teaching Procedures:

　　1）Revision

　　Ask two students to the front to write the answers on the Bb.

　　What is important about these dates or figures?

　　1524: an Italian explorer ;the first westerner discovered the islands 

　　1858: an area of poor housing, factories and farm buildings was torn down and Central Park was created, reaching from 59th Street to 110th Street and across three avenues.

　　1892: the age of mass arrivals began

　　1900: the building of skyscrapers in New York began

　　1931: the Empire State Building was completed, then the tallest building in the world.

　　(2) Presentation

　　Find out how much the students know about the central plains of America.

　　(3) Scanning

　　Ask the students to go through the whole passage very fast to get the general idea of the lesson.  1. The settlers killed them, forced them to leave their hunting grounds, broke agreements which they had made, froced them onto poor land, and killed most of the bison on which Native Americans had relied for food.

　　2. The killing of large numbers of bison changed the whole wildlife chain on the plains.

　　(4) Reading and do Ex. 1

　　Where were the Native Americans thought to come from?

　　Who brought the first horses to the American continent?

　　What did the Native Americans use the wild horses for?

　　What kind of animal is a bison?

　　What happened to Native Americans when European settlers began to move westwards?

　　What made the settlers kill even more bison?

　　How did the killing of the bison change the whole wildlife of the plains?

　　(5) Reading Comprehension

　　The first settlers were Native Americans who lived buy hunting animal and gathering food.

　　The first horses were brought to America by the Spanish.

　　True

　　They were forced to move away.

　　True

　　True

　　Native Americdans msade use fo the whole animal when they killed it, but later settlers took only the skins of the bison.

　　True

　　(6) Language study

　　Point out the main language points. Ask the students to do some exercises after each explanation. The following points are to be dealt with.

　　by doing sth

　　now that

　　in huge / large / big / great numbers

　　take possession of

　　object to sth/doing sth

　　give in / give away / give off / out

　　have an effect on / have effects on / have no effect on

　　Translation:

　　人们认为他们是在三万多年以前从亚洲跨越一座陆桥来到美洲的。

　　既然你已经康复了，你就可以跟他们一起工作。

　　食品供应源源而来。

　　那对老年夫妻大约在30年前就买了那所房子。

　　他们中大多数人反对我的想法。

　　他们拒绝投降，战斗到底。

　　春寒通常对植物的生长不利。

　　这种药对你的身体没有副作用。

　　(7) Assignment

　　Ex. 3

　　Two copies of reading comprehension

　　(8) Blackboard Design:

Settlers kill bison.	Bison stop eating the grass.	The grass grows less well.
	No bison waste falls on the ground.	The soil becomes poorer.
Fewer wolves.	Fewer insects Few birds Fewer prairie dogs	Fewer plants.