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What is the BEST conductor of electricity？
A.Carbon dioxide
B.Distilled water
C.Fresh water
D.Salt water
答案
更多“What is the BEST conductor of electricity？A.Carbon dioxideB.Distilled waterC.Fresh waterD.”相关的问题
第1题
In what way was the blackout of 1977 different from that of 1965？
A. There was much more disorder.
B. This time the electricity supply failed.
C. People did not expect it.
D. Fewer people were arrested in the blackout of 1977.
第2题
What caused the blackout in July 1977？
A. During a storm, lightning damaged cable.
B. Because of unemployment.
C. Heat waves had made people use too much electrical power.
D. Because the looters damaged the electricity supply.
第3题
brain alone, but that one’s muscles also participate (take part in). It may be said that we think with our muscles in somewhat the same way that we listen to music with our bodies.
You surely are not surprised to be told that you usually listen to music not only with your cars but with your whole body. Few people can listen to music that is more or less familiar without moving their body or, more specifically, some part of their body. Often when one listens to a symphonic concert on the radio, he is tempted to direct the orchestra (music band) even though he knows there is a competent conductor on the job.
Strange as this behavior. may be, there is a very good reason for it. One cannot derive all possible enjoyment from music unless he participates, so to speak, in its performance. The listener "feels" himself into the music with more or less pronounced motions of his body.
The muscles of the body actually participate in the mental process of thinking in the same way, but this participation is less obvious because it is less pronounced.
1、Few people are able to listen to familiar music without ______.
A、moving some part of their body
B、stopping what they arc doing to listen
C、directing the orchestra playing it
D、wishing that they could conduct music properly
2、Body movements are necessary in order for the listener to ______.
A、hear the music
B、enjoy the music fully
C、appreciate the music completely
D、understand the music
3、The best title for this selection is______.
A、An Ear for Music
B、Music Appreciation
C、How Muscles Participate in Menial Acts
D、A Psychological Definition of the Thinking Process
4、The pronounced body motions are a listener’s way of ______.
A、"feeling" the music
B、participating in the performance
C、deriving enjoyment from the music
D、all of the above
5、Some psychologists maintain that thinking is ______.
A、not a mental process
B、more of a physical process than a mental action
C、a process that involves our entire bodies
D、a process that involves the muscles as well as the brain
第4题
(课外选材)
When computer servers operate a complex program, they can get very hot. Cooling the servers can be costly. So researchers asked what would happen if the heat created by the servers could be captured and used？
Data centers of large Internet companies such as Google and Microsoft have thousands of computer servers. As these servers process information, they create large amounts of heat, so they need huge cooling systems. These systems send the heat into the air. The Dutch company Nerdalize thinks paying for electricity to operate the servers and then paying again to cool them is a waste of energy. So it developed a device called the e-Radiator. It is a computer server that also works as a heating source. Boaz Leupe is the chief executive officer of Nerdalize. He says the e-Radiator saves money because companies don't have to pay to cool their servers.
"The kilowatt(千瓦)hour you are using is used twice -- once to heat the home and once to compute the client's task without the cooling overhead." He says five homeowners in the Netherlands are testing the heating device in their homes. "We reimburse the electricity the server uses, and that we can do because of the computer clients on the other side, and, in that way, homeowners actually get heating for free, and computer users don't have to pay for the overhead of the data center.
Jan Visser is one of the participants in the year-long experiment. He says the amount of heat produced by the e-Radiator depends on the work being done by the computer server. He says it cannot be used as the primary source of heat. But he is ready to try it.
He says if it provides enough warmth, he will be able to use his home's heating system less, which will save him money. Nerdalize says e-Radiators create heat temperatures of up to 55℃. It says the devices could save users up to $440 in heating costs a year.
1.Why did researchers ask what would happen if the heat created by the servers could be captured and used？{A; B; C}
A. Because computers can get very hot.
B. Computer servers is a complex program.
C. Cooling computer servers costs a lot of money.
2.The computer servers in large Internet companies such as Google and Microsoft can {A; B; C}.
A. create large amounts of information
B. create large quantity of heat
C. manage the huge cooling systems
3. Nerdalize developed the e-Radiator because {A; B; C}.
A. e-Radiator cost less energy
B. e-Radiator can cool the servers for free
C. e-Radiator can create cold air for free
4.According to Jan Visser, the amount of heat produced by the e-Radiator {A; B; C}.
A. depends on the work being processed by PC
B. cannot be used as the home's heating system
C. cannot be used as the main source of heat
5.The best title for this passage is {A; B; C}
A. The New Way to Heat Homes
B. The New Way to Cool Homes
C. Hot Computers Could Be Used for Free
第5题
So severe was the disruption (破坏) in New York State that its governor, George Pataki, declared a state of emergency. Confused workers spilled on to the streets, while thousands more were trapped for hours in lifts and hot, crowded subway trains. Lots of stranded (进退两难的) people ended up spending Thursday night on New York's streets. Thieves in Brooklyn in New York, and in Canada's capital, Ottawa, took advantage of the absence of streetlights and burglar alarms, and went on a looting spree (疯狂抢掠). Officials were taken aback by the speed at which the chaos unfolded. President George Bush described the incident as a "massive national problem" and promised a full investigation into what caused it.
That is still a matter of some debate. At first, naturally, there were fears of terrorist involvement, but this was quickly ruled out. However, officials were left arguing about what had actually happened. The office of Canada's prime minister, Jean Chretien, said that a severe accident at a nuclear-power plant in Pennsylvania may have been the cause. Earlier, American and Canadian officials had said a fire or perhaps lightning had hit a power plant near Niagara Falls in New York State.
1、Several cities were affected by the massive power failure on August 14th except____.
A、Ottawa
B、Cleveland
C、Chicago
D、Brooklyn
2、The word "outage" in Paragraph 1 can be best replaced by____.
A、power shortcut
B、 disruption
C、 massive national problem
D、 power failure
3、Which of the following statements is true according to the passage？____
A、Many streetlights and burglar alarms were stolen during the blackout.
B、Some terrorists were involved in the incident.
C、President George Bush demanded a full investigation into the disruption in New York.
D、Officials were not sure what had caused the power failure.
4、It can be inferred from the passage that____.
A、France has a population of about 60 million.
B、Only some large cities were affected by the power failure.
C、 Canada's prime minister knew what had caused the power failure.
D、Water was spilt onto the streets by confused workers.
5、The power failure on August 14th brought about big chaos except that____.
A、thousands of people were trapped in lifts
B、 many people had to stay on streets for Thursday night.
C、 stores were robbed by the thieves.
D、a power plant near Niagara Falls was hit by a fire or lightning.
第7题
What is the best title for this passage？
A．Traveling in Japan.
B．How to Draw a Map.
C．Finding Your Way in Tokyo.
D．The Largest City in the World.
第8题
A.What would you like for dinner
B.Which one do you like best
C.What’s in your schoolbag
第9题
Perhaps the best known are the electric rays, or torpedoes (电鱼), of which several kinds live in warm seas. They posses on each side of the head, behind the eyes, a large organ consisting of a number of hexagon- al shaped cells rather like a honeycomb. The cells are filled with a jelly-like substance, and contain a series of flat electric plates. One side, the negative side, of each plate, is supplied with very fine nerves, connected with a main nerve coming from a special part of the brain. Current passes from the upper, positive side of the organ downwards to the negative, lower side. Generally it is necessary to touch the fish in two places, completing the circuit, in order to receive a shock.
The strength of this shock depends on the size of the fish, but newly born ones only about 5 centimeters across can be made to light the bulb of a pocket flashlight for a few moments, while a fully grown torpedo gives a shock capable of knocking a man down, and, if suitable wires are connected, will operate a small electric motor for several minutes.
Another famous example is the electric eel. This fish gives an even more powerful shock. The system is different from that of the torpedo in that the electric plates run longitudinally (纵向) and are supplied with nerves from the spinal(脊骨)cord. Consequently, the current passes along the fish from head to tail. The electric organs of these fish are really altered muscles and like all muscles are apt (likely) to tire, so they are not able to produce electricity for very long.
The power of producing electricity may serve these fish both for defence and attack.
It can be seen from the passage that ______. ()
A．the capacity to generate electricity is the distinctive characteristic of the fish
B．the current travels in an upward direction from the positive side to negative side in torpedo's electric cells
C．some fish can produce enough electricity to drive a number of electric motors
D．the torpedo's electric cells have a shape with six sides
第10题
A.Designing an Effective Questionnaire.
B.Questionnaire is the best way to collect data from many people.
C.Questionnaire benefits our life.
