冀教版八年级下册Unit 3 Animals Are Our Friends Lesson 17 Save the Tigers知识点集结与练习（含答案）

Lesson 17
1.At the beginning of the 20th century, the number of tigers in the wild was around 100 000.
1)在…的开始at the beginning of, 起初 in the beginning
2) …的数量 the number of+可数名词复数
作主语，谓语用单数
许多，大量 a large number of+可数名词复数，作主语，谓语动词用复数。
3）the 20th century 20世纪
在某世纪In+ the +序数词+century
在某世纪某年代 in the +整十年份+s/’s
In the 1990s 在20世纪90年代
2.Today that number has dropped to a few thousand.现在老虎的数量下降到几千了。
drop vt.& vi.（使）落下;（使）降低;减少
vt.放弃n.滴;少量
下降至，跌到drop to
退出 drop out of
辍学 drop out of school
3.Tigers are symbols of strength and courage.老虎是力量和勇气的象征。
The symbol of …的象征
Courage n 勇气
encourage vt 鼓励 encourage sb to do鼓励某人做某事
4.brave adj 勇敢的 adv bravely
n bravery 勇敢
5.The tiger is at the top of the food chain.
老虎在食物链的顶端。
Chain n 链子，链条
Food chain食物链
6.In recent years,tigers have been in danger of disappearing.
disappear v 消失，失踪—反义词 appear
in recent years近几年，现在完成时的标志词
处于危险in danger
处于…的危险in danger of+doing
7. It helps keep the number of other wild animals in balance.
Balance n 平衡 balanced adj 均衡的
Keep…in balance.保持…的平衡
Keep/lose one’s balance 保持/失去平衡
A balanced diet均衡的饮食
8.For this reason,tigers are important to the environment.
For “因为”，表原因
9.People have cut down a lot of trees as well.人们还砍伐了大量的树木。
cut down 砍倒，减少
as well也，和，
as well/ too---多用于肯定句句末，as well不用逗号与句子隔开。
Also—用于肯定句中。实义动词前，助动词系动词或情态动词后。
Either-否定句末



练习
一，短语填空
1.在….之初 ___________ 2.下降到____________ 3.食物链 _____________
4.保持平衡____________ 5.处于…的危险__________6.砍倒，减少 _______
7.还，也 ______________ 8.…. 的数量 ______________
9.勇气和力量的象征___________________________
二 填空
1. At the beginning of the 20th ________(世纪)，the number of tigers in the wild was around 100，000.
2. What a _______(勇敢) man! He jumped into the water _______(勇敢) and saved the girl.
3. She has enough________(勇气) to lift the heavy box.And she __________(鼓励) us to do so.
4. The zookeeper was ________(save) the sick tiger’s life.Finally, the tiger was __________(save).
5. The number of birds in this tree ______(be)about 8 000.
A number of birds _______(be) from the south.
6.We are going to Australia at the __________(begin)of this term.
7.This kind of animal disappeared in the ___________(nineteen) century.
8.We have no r______ to believe that they are wrong.
9.Don’t play with glass,or you will c________your finger.
10. The boy answered the question ________(quick)．He has a _______ (quick) mind.
三、用合适的介词填空
1．We held a sports meeting ________the end of last term.
2．Parents ask their children to eat some fruit. They want to keep their diet ________ balance.
3．Tigers live ________the forests of Asia.
4．This animal is ________the top of the food chain.
5．Plants are important ________ the people.
6. _______ this reason, they didn’t go on a picnic.

四单选
1．—What ________ will global warming(全球变暖)bring us?
—Scientists have given us a clear list.
A．news　　　　　　　 B．dangers
C．courses D．advantages
2．If farmers ________ trees and forests，giant pandas ________nowhere to live.
A．cut down；have
B．will cut down；will have
C．will cut down；have
D．cut down；will have
3．—What did you do yesterday evening, Gina?
—I ________ Titanic in the City Cinema.
A．watch B．watched
C．am watching D．will watch
4.Her mother posted her some books and a lot of money _______.
A either B also C as well as D as well
5.There ______ a number of books in the library and the number of them ______increasing.
A has, is B have, are C are, is D is ,are







答案 一 略
二 1.century 2.brave,bravely 3,courage,encourage 4.saving,saved 5.is,are 6.beginning 7.nineteenth 8.reason 9.cut 10.quickly,quick
三 .at　 in　 in　 at　 to for
四 BDBDC