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Techniques to harness the energy of the sun are being developed.
A:convert
B:store
C:utilise
D:receive
B:store
C:utilise
D:receive
参考答案
参考解析
解析：本句意思：利用太阳能的技术正处于研究中。harness控制（情感），利用（自然力）。 utilise利用，使用；convert转换；store储存；receive接收，收到。
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Techniques to employ the energy of the sun are being developed.A:convert
B:store
C:use
D:receive
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共用题干
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共用题干
Electromagnetic Energy1 White light seems to be a combination of all colors.The energy that comes from a source of light is not limited to the kind of energy you can see.Heat is given off by a flame or an electric light.On a cloudy day it is possible to get a sunburn even though you feel cool.Visible light and the kinds of energy that produce warmth and sunburn are examples of electromagnetic energy.2 The sun is 93 million miles from the earth.Yet we can use energy from the sun because electromagnetic energy travels through space.3 Many other kinds of energy are also types of electromagnetic energy.Radio,television,and radar signals travel from transmitters to receivers as low-energy electromagnetic waves.Infrared（红外线的）radiation is an electromagnetic wave.When it is absorbed by matter,heat is produced.Waves of infrared and visible light have more energy than waves of radio,television,or radar.Ultraviolet rays（紫外线）and X-rays are electromagnetic waves with even greater amounts of energy.Infrared radiation is used in cooking food and heating buildings. Sunlight and electric lights are part of our requirements for normal living.Ultraviolet radiation is useful in killing certain disease organisms.X-rays and gamma rays have so much energy that they travel through solid objects. They can be used to detect and treat cancer.X-rays are used in industry to find hidden cracks in metal,and in medicine to reveal broken bones.4 Usually we use electricity to generate electromagnetic energy.The source of most of our energy is the sun.Heat from the sun causes water to evaporate.When the water falls to the earth as rain,some of it is trapped behind dams and then used to operate electric generators.Other generators are powered by coal,but the energy stored in coal came from the sun,too.5 Until recently,the source of the tremendous amount of energy given off by the sun was a puzzle.If the sun depended on chemical reactions,it would have used up all its energy long ago.Experiments with electromagnetic radiation led to the theory that mass can be converted into energy.About forty years after the theory was proposed , nuclear energy was harnessed（利用）by man.Chemical energy comes from electron （电子）rearrangement.Nuclear energy comes from a change in the nucleus of an atom.Compared with chemical reactions,nuclear reactions release millions of times more energy per pound of fuel.We now believe that the sun's energy comes from the nuclear reactions in which hydrogen is changed into helium（氦）.6 Nuclear energy is beginning to compete with coal as an economical source of'power to generate electricity.It is also being used to operate engines in large ships.Scientists continue to seek new and better methods of obtaining and using energy.Paragraph 4______A:Nuclear Reactions as the Lasting Source of the Sun's EnergyB:The Most Important Source of EnergyC:Types of Electromagnetic EnergyD:The Machines Used for Energy GenerationE:Seeking New Sources of EnergyF:The Use of Ultravio1et Radiation in Medicine
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共用题干
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考题
共用题干
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考题
Techniques to harness such energy are yet to be developed.A:convert
B:utilize
C:store
D:receive
考题
Which of these technologies is characterized as being a multipoint Layer 2 VPN that connects twoor more customer devices using Ethernet bridging techniques？（）A、 DPTB、 MPLSC、 VPLSD、 CWDME、 DWDMF、 SONET/SDH
考题
Which of the following is the MOST important reason for referencing the HCL？（）A、 To ensure that all hardware being used has previously been testedB、 To ensure that all hardware being used has the latest firmwareC、 To ensure that all hardware being used is the most energy efficientD、 To ensure that all hardware being used can be upgraded in the future
考题
单选题The NIF process of nuclear fusion involves ______.A
high lab temperatures of about 10 million CelsiusB
ultra powerful lasers being used to produce huge gravitational pressureC
deuterium and helium being fused together to form tritiumD
delivering ultraviolet energy to hit the target
考题
单选题As they use energy only for motion, a snake can live longer without food than a human being。A
they useB
forC
without foodD
than
考题
单选题The centrifugal pump component responsible for converting the mechanical energy of the liquid being pumped, to that of kinetic energy is the （）.A
electric motorB
voluteC
impellerD
diffusion nozzle
考题
单选题Only a small part of the sun’s energy reaches the earth’ s surface because most of it is ______.A
absorbed by the clouds in the lower atmosphereB
reflected by the gases in the upper atmosphereC
lost in the upper and lower atmosphereD
used to evaporate water from the oceans and lakes
考题
单选题The basic function of the centrifugal pump impeller is to （）.A
directly increase the pressure of the liquid being pumpedB
directly increase the velocity of the liquid being pumpedC
convert the potential energy of the liquid to kinetic energyD
separate air from the liquid being pumped
考题
单选题There are different forms of energy, _____ come from the sun.A
thatB
most of thatC
most of themD
most of which
考题
单选题Which of the following is the MOST important reason for referencing the HCL？（）A
To ensure that all hardware being used has previously been testedB
To ensure that all hardware being used has the latest firmwareC
To ensure that all hardware being used is the most energy efficientD
To ensure that all hardware being used can be upgraded in the future
考题
单选题Which of these technologies is characterized as being a multipoint Layer 2 VPN that connects two or more customer devices using Ethernet bridging techniques?（）A
DPTB
MPLSC
VPLSD
CWDME
DWDMF
SONET/SDH
考题
单选题We learn from the passage that ______.A
all living things on the earth depend on the sun for their foodB
a forest looks dark in winter because it absorbs solar energyC
only 0.023 of the energy from the sun is made use of on the earthD
greenhouse gases allow heat energy to escape from the earth’ s surface
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