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To extinguish (熄灭) different kinds of fires, several types of fire extinguishers have been invented. They must be ready for immediate use when fire breaks out. Most portable (手提式的) kinds operate for less than a minute, so they are useful only on small fires. The law requires ships, trains, buses and planes to carry extinguishers.
Since fuel, oxygen (氧气) and heat must be present in order for fire to exist, one or more of these things must be removed or reduced to extinguish a fire. If the heat is reduced by cooling the material below a certain temperature, the fire goes out. The cooling method is the most common way to put out a fire. Water is the best cooling material because it is low in cost and easy to get.
Another method of extinguishing fire is by cutting off the oxygen. This is usually done by covering the fire with sand, steam or some other things. A blanket may be used do cover a small fire.
A third method is called separation, which includes removing the fuel, or material easy to burn, from a fire, so that it can find no fuel.
The method that is used to put out a fire depends upon the type of fire. Fires have been grouped in three classes. Fires in wood, paper, cloth and the like are called Class A fires. These materials usually help keep the fire on. Such fires can be stopped most readily by cooling with water.
1.If a fire breaks out on a bus, which of the follow should be ready there for you to use?
A. Sand B. Water
C. A blanket. D. An extinguisher.
2.To cover a small piece of burning wood with a basin in order to stop the fire is an example of .
A. separating the fire B. reducing the heat
C. removing the fuel D. cutting off the oxygen
3.In choosing how to put out a fire, we should first be clear about .
A. when it breaks out B. how it comes about
C. what kind it is D. where it takes place
4.What would the author probably discuss in the paragraph that follows?
A. Another class of fires B. Another type of extinguishers
C. How fires break out. D. How fires can be prevented.
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A good teacher is one who remembers what it was like to be young. As he 1 himself in his student’s place, he is able to understand his 2 and they’re able to understand him. 3 ,he remembers that his students have a real 4 for knowledge. He therefore keeps up with 5 developments in his field so that his 6 are lively and up-to-date.
Secondly, he is 7 what it was like to be bored 8 ,so he will make an effort 9 interesting. He neither mumbles(含糊的说话)his material 10 reads it from old notes.
Instead, he 11 his lectures to follow by turns with discussion and make his 12 more active, spirited with examples.
Most important, a good 13 remembers how sensitive his feelings were 14 he was young. He knows how important his 15 can be and is never unkind or 16 critical. He also remembers that he 17 the instructors who asked the most 18 him. So he tries to be, in 19 ,the teacher he dreamed of 20 when he was young.
1.A.lay B.placed C.put D.made
2.A.pupils B.classmates C.fellows D.friends
3.A.The first B.One C.Above all D.First
4.A.thirst B.requirement C.wish D.desire
5.A.the later B.the latest C.later D.the lateliest
6.A.materials B.classes C.pupils D.teachers
7.A.sure B.known C.clear D.clever
8.A.at school B.in school C.on duty D.in class
9.A.to do B.to be C.to have D.to get
10.A.or B.no C.not D.nor
11.A.should make B.could have C.would cause D.might let
12.A.lecture notes B.classes C.lessons D.words
13.A.teacher B.man C.student D.headmaster
14.A.so B.how C.and D.when
15.A.friendship B.kindness C.subjects D.activities
16.A.necessarily B.very C.unnecessarily D.greatly
17.A.hoped B.respected C.longed D.wished
18.A.about B.to C.at D.of
19.A.words B.short C.word D.sentence
20.A.taking B.doing C.having D.being
查看习题详情和答案>>To extinguish (熄灭) different kinds of fires, several types of fire extinguishers have been invented. They must be ready for immediate use when fire breaks out. Most portable (手提式的) kinds operate for less than a minute, so they are useful only on small fires. The law requires ships, trains, buses and planes to carry extinguishers.
Since fuel, oxygen (氧气) and heat must be present in order for fire to exist, one or more of these things must be removed or reduced to extinguish a fire. If the heat is reduced by cooling the material below a certain temperature, the fire goes out. The cooling method is the most common way to put out a fire. Water is the best cooling material because it is low in cost and easy to get.
Another method of extinguishing fire is by cutting off the oxygen. This is usually done by covering the fire with sand, steam or some other things. A blanket may be used do cover a small fire.
A third method is called separation, which includes removing the fuel, or material easy to burn, from a fire, so that it can find no fuel.
The method that is used to put out a fire depends upon the type of fire. Fires have been grouped in three classes. Fires in wood, paper, cloth and the like are called Class A fires. These materials usually help keep the fire on. Such fires can be stopped most readily by cooling with water.
68. If a fire breaks out on a bus, which of the follow should be ready there for you to use?
A. Sand B. Water C. A blanket. D. An extinguisher.
69. To cover a small piece of burning wood with a basin in order to stop the fire is an example of .
A. separating the fire B. reducing the heat
C. removing the fuel D. cutting off the oxygen
70. In choosing how to put out a fire, we should first be clear about .
A. when it breaks out B. how it comes about
C. what kind it is D. where it takes place
71. What would the author probably discuss in the paragraph that follows?
A. Another class of fires B. Another type of extinguishers
C. How fires break out. D. How fires can be prevented.
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Last week’s topic: What’s your opinion about cheating in exams?
Wilson 822 (Fujian): An oath isn’t enough to keep anyone from cheating. Who can tell that they won’t promise something that goes against their will? So I think the punishment is important. Punishments should be serious enough to stop people breaking the oath!
Wang Changling (Anhui): The oath itself makes all test-takers think that others may consider them would-be cheaters, which can hurt their feelings. In my opinion, prevention is better than a punishment. Educators should set good examples for students to follow and be role models for them. Even if only a few educators continue to copy other people’s work and their research papers, surely, students will follow.
Anonymous(匿名的): I support the school’s action against cheating. Although the oath isn’t a duty, it can warn the would-be cheater.
Cathy Cheng: I find it is hard to refuse a friend who wants help in exams. And I think the rule of Maryland University gives the students like me a good excuse to refuse.
Zzq8301: I think it is a promising step toward what we’re talking about when we say “fair play” these days. Cheaters should be stopped because they make it difficult for the honest to succeed.
Freda (Tianjin): I was told by my foreign teacher to write down the oath on the back of my test paper in the same way that was described in the article. It is a rule everyone should obey in a fair game. Whether this method succeeds or fails is up to you. What I want to say is to be true to yourself.
60. The underlined word “oath” in Paragraph 2 may have the same meaning as “_________”. [来源:Z&xx&k.Com]
A. idea B. promise C. plan D. opinion
61. It is clear that people mentioned in the text are talking about the rule made by _________.
A. Maryland University B. some colleges
C. the Education Department D. the government
62. How many people are in fact in favor of the rule?
A. 3 B. 2 C. 4 D. 5
63. Who think teachers should set a good example?
A. Wilson 822 B. Freda C. Cathy Cheng D. Wang Changling
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C. teaching C. lift C. mean C. abandoned C. like C. places C. deal with C. anything C. to be doing C. successfully C. final C. solving C. shortly after C. may C. probably C. pathline C. j udgement C. Because C. unchanged C. uncommon |
D. searching |