This is the same pen tha t I lost. 这正是我掉的那支钢笔。
2 )辨异: ago, before, adv.
这两个词都有“以前”的意思。
ago 意为“ 从前”, 指从此刻起若干时间以前的时间或场合, 因此动词要用过去式。
He left for Australia three months ago.
他三个月前就到澳大利亚去了。
They came back a long while a go. 他们回来很久了。
before 意为“以前”。指从过去某一时刻起若干时间以前的时间或场合, 因此动词既可用一般过去式, 也可用完成式。也可以单独使用, 指从前。
I had never seen him before. 我以前从没有见过他。
Father told you before. 父亲早就告诉过你。
7.It is time to learn how to protect our atmosphere, the roof over the world of man. 该是学会保护大气层这个世界屋顶的时候了。
1 )It is time to / (that).这是一个句型, 其含义为“ 是该做..的时候了”。该句型后如果跟that 引导的定语从句, 定语从句的谓语动词用一般过去式, 但偶尔也可用would(或should)+ 动词原形, 或had rather(would rather)+ 动词原形。
It is time to tell him the news. 是该告诉他这个消息了。
It is time for me to go. 我该走了。
It is time (that)we had something to eat. 吃饭的时间到了。
It is time (that)we went to bed. 我们该睡觉了。
2 )the roof over the world of man 在句中用作同位语, 它对与之同位的名词atmosphere 提供补充说明, 起修饰和描绘的作用。
Playing football, his only interest in life, has brought him many
friends. 踢足球(他一生中惟一的爱好)使他交了很多朋友。
She liked her job, teaching English. 她喜欢她的工作: 教英语。
3 )辨异: protect, guard, defend, v.
它们都有“保护”的意思。
protect 保护、防护。它主要指用覆盖、屏护或防护物等去尽力照顾某人或某物以防受损害。
Our government is taking measures to protect wild resources.
我们政府采取措施保护野生资源。
The frontier is protected by mine fields and an electric fence.
边境线由几个布雷区和一道电网保护着。
guard 看守, 保卫。它主要指小心看护某人或某物, 不至于发生危险, 使其确保安全。
The soldiers were guarding the bridge. 战士们正守护着大桥。
In those days the place was heavily guarded.
那时, 这个地方重点防守。
defend 保卫, 保护。它是一个普通用语, 常指用武力或其他措施抵抗别人的攻击来保卫自身的安全。
We fought to defend our liberties. 我们为扞卫自己的自由而战。
It is the duty of every citizen to defend his country.
保卫祖国是每个公民的职责。
练习答案
课文A 练习
I. 阅读理解:
1. c. 2. a 3. b 4. d 5. d
II. 找出下列单词或短语的同义词:
1. transmit 2. access 3. remote 4. demonstrate 5. instruction 6. simultaneously 7. travel 8. available 9. privacy 10. applica- tion
III. 从课文中选出单词或短语完成句子:
1. televison broadcasts , telephone calls , printed materials such as books and magazines
2. an education and entertainment center
3. transmits, stores, displays
4. telephone calls
5. a risk to our privacy
IV. 用正确的介词填空:
1. over 2. via 3. to 4. of 5. for 6. at 7. on 8. of 9. from 10. between V. 将下列句子译成英语:
1. The information stored in the computer can be transmitted via satellites to users.
2. Now a single satellite is able to receive and transmit 18 000 telephone calls simultaneously.
3. The new and advanced technology help us as well as harms us.
4. It is important to learn computers well in order to meet the 21st century.
5. The purpose of learning a new technology is to apply it.
词汇练习
I. 用所给单词的正确形式填空, 注意词性:
1. a. extablished b. established(a. )c. establishment 2. a. signal b. signals c. sign 3. a. entertainment b. entertainer c. will entertain 4. a. limited b. limit, limit c. unlimited II. 用下列所给单词的正确形式填空:
1. displayed 2. theory 3. established 4. remote 5. visual 6. signaled 7. access 8. channel 9. transmitted 10. transportation III. 把下列句子译成英语:
1. Satellites are capable of transmitting not only television broadcasts , but also telephone calls.
2. In theory, everyone can be educated.
3. You should follow the doctor’s instructions on how to take the medicine.
4. The computer system is able to transmit sounds as well as pictures.
5. It is the modern technology that leads us to success.
6. This patient should be isolated from the other patients.
7. This soldier displayed his bravery and skills.
8. His experiments have fully demonstrated the psychological principle.
课文B 练习
I. 根据课文判断下列句子正确与否:
1.× 2. √ 3. √ 4. √ 5.× 6. × 7. √ 8. √ 9. √ 10.×
II. 根据课文填上所缺的内容:
1. Where 2. deadly
3. 2 000 pounds 4. the coal, oil, and gas we have on earth
5. our bodies 6. powerful current of electrical energy
7. the electric energy 8. the energy in the atmosphere
9. automobiles , airplanes, factories, atomic explosions
10. learn how to protect our atmosphere, the roof over the world of man
词汇练习
I. 从右边一栏中找出与左边一栏单词相应的定义:
1. d 2. c 3. b 4. e 5. a
II. 用课文B 中的单词或短语填空。首字母已给出:
1. atmosphere 2. existence 3. thorough 4. radar 5. elements 6. protect, from 7. caused 8. rest upon 语法练习
I. 划出下列句子的不定式并说明其语法功能:
1. to say like it 主语
2. to discover the secret 结果状语
3. how to make use of the waste paper 宾语
4. to tell the difference between the two 主语
5. to miss the train 目的状语
6. to improve the present economic situation 定语
7. To be a teacher of the people 状语
8. grow 宾补
9. to write a story 宾语
10. be treated in that way 宾补
11. to make such an experiment 定语
12. to take care of so many children 主语
13. to hear her talk like that 原因状语
14. to be very interesting 主补
15. to be waiting for us here 宾补
16. to be discussed today 定语, how to divide the work among ourselves 表语
17. to attend the meeting 主补, to be held in Room 201 定语
18. to have seen your performance 原因状语
19. to learn new words 目的状语
20. to build their houses by instinct 主补
II. 用所给动词的不定式的适当形式填空:
1. to drive 2. to take 3. to be praised 4. ring 5. to go 6. to be invited 7. to be sent to work 8. take 9. to have heard 10. to learn III. 把下列句子译成英语, 划线的动词用不定式形式:
1. He has his own way to learn foreign languages.
2. Sometimes it is necessary for us to learn from mistakes.
3. She decided to leave the hotel at 3: 00 in the afternoon.
4. He is said to have a bright future.
5. Many farmers leave their hometown for Beijing to look for jobs.
6. It took Columbus more than two months to sail across the Atlantic Ocean.
7. Do you have any question to ask？
8. This room is not big enough to hold so many people.
9. In the traditional family, mother’s duty is to take care of the children.
10. She is too young to understand the things.