Unit 13 We’re trying to save the earth!
Section A3a-3b同步习题（附答案）
I.根据汉语提示完成单词。
1. Carl is planning to travel by ship because he wants to see the _____ (沙鱼）in the sea.
2. You should teach them the _____(方法）of how to grow apples instead of giving them apples.
3. It’s ______(有害的)to throw the old battery in the water.
4. Many countries have made ____（法律）to keep the animals.
5. If the animals are endangered , it may broke the ______ (生态系统）of the world.
IⅠ.用括号内所给单词的适当形式填空。
6.Hainan is in the _________（south） part of China.
7.We all support his __________（science） research.
8.This is an ____________ （danger） animal. We should try to save it.
9.________（shark） are very smart animals,we should also protect them.
10.In fact, sharks are ________（catch）and traded every year.
IⅡ.用方框中所给单词的适当形式填空。
harm,law,industry,science,cruel
11.It has been written into _____ that drunk driving can be a crime.
12.It is ______ of the man to throw stones at the homeless dog.
13.The expert gave us a __________ explanation on why the robot could talk.
14.With the development of _________,the sky in our city isn’t so clean as before.
15.Charlie，don’t read in the sun.It’s _________ to your eyes.
Ⅳ.按要求完成句子。
16.保护海洋生态系统食物链的平衡非常重要。
It’s very important to keep the balance of the ______ _______ in the ocean ___________.
17.到目前为止,我们已经完成了所有的工作。____ _____,we have finished all the work.
18.你最好不要经常看5D电影，它们对你的眼睛有害。
You’d better not watch 5D films too often. They _____ _________ ____ your eyes.
19.你听说这个消息了吗 下次会有一些交换生来我们学校。
Have you_______ ____ the news Some exchange students will come to our school next time.
20.听！贾森在练歌房里引吭高歌。
Listen! Jason is singing ____ _____ _____ ____ his voice in the singing hall.
Ⅴ.完形填空。
Good morning，ladies and gentlemen.Today，I’ll talk about two of the problems we have in our community these days—the problems of dogs and the objects falling from 21 . They are getting worse and worse. We have received a lot of letters about such problems，so it’s time to work out these problems.
Some dogs aren’t looked 22 well，and they freely make mess on roads and in gardens. This makes our community 23 .I’d like to tell the dog-owners that their behavior is too bad，and they are always making people feel 24 . Next time when you walk your dogs outside，please take a plastic bag along and 25 the mess your dogs make.
Some people throw rubbish out of the windows.It’s 26 because falling objects may hurt others. You know，it is against the law（法律）. We should 27 a notice to warn people not to do so. If it’s found，we’ll 28 the names and addresses of those people.Then，a written warning will be sent to their homes and they will be 29 by law.
A safe and comfortable living environment is important to us. 30 we try our best to care for our community，it will be a good place to live in.
21.A. doors B. windows C. cars D. trains
22.A. after B. for C. out D. at
23.A. dirty B. popular C. beautiful D. clean
24.A. moved B. unhappy C. embarrassed D. relaxed
25.A. clean up B. make up C. take up D. set up
26.A. intelligent B. valuable C. dangerous D. endangered
27.A. put up B. put on C. put away D. put out
28.A. receive B. record C. reflect D. retell
29.A. praised B. performed C. punished D. processed
30.A. If B. Before C. Although D. So
参考答案
1.sharks 2.method 3.harmful 4.laws 5.ecosystem
6.southern 7.scientific 8.endangered 9.Sharks 10.caught
11.law 12.cruel 13.scientific 14.industry 15.harmful
16.food chain ecosystem 17.So far 18.are harmful to
19.heard of 20.at the top of
21-25BAABA 26-30CABCA

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