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[单选题]

Solar and wind power are intermittent by nature, which brings us to another major technical issue with RE: the storage.

A.continuous

B.endless

C.sporadic

D.regular

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更多“Solar and wind power are inter…”相关的问题

第1题

Although April did not bring the rains we all hoped for, and although the Central Valley doesn’t generally experience the atmospheric (大气的) sound and lightning that can accompany those rains, it is still important for parents to be able to answer the youthful questions about thunder and lightning.

The reason that these that these two wonders of nature are so difficult for many adults to explain to children is that they are not very well understood by adults themselves. For example, did you know that the lighting we see flashing(闪烁) down to the earth from a cloud is actually flashing up to a cloud from the earth? Our eyes cheat us into thinking we see a downward motion when it’s actually the other way round. But then, if we believe only what we think we see, we’d still insist that the sun rises in the morning and sets at night.

Most lightning flashes take place inside a cloud, and only a relative few can be seen jumping between two clouds or between the earth and a cloud. But, with about 2,000 thunderstorms taking place above the earth every minute of the day and night, there’s enough activity to produce about 100 lightning strikes on the earth every second.

Parents can use thunder and lightning to help their children learn more about the world around them. When children understand that the light of the lightning flashes reaches their eyes almost at the same moment, but the sound of the thunder takes about 5 seconds to travel just one mile, they can begin to time the interval between the flash and the crash to learn how close they are to the actual spark.

26. According to the first paragraph, in the Central Valley area, rains come _____.

A. when it is April

B. when the field is dry

C. when people all hope for it

D. usually without thunder and lighting

27. We tend to think that lighting moves downward because_____.

A. our eyes play a joke on us

B. we take it to be true scientifically

C. we cannot see it clearly most of the time

D. it always runs down from a cloud to the earth

28. Which of the following is NOT true about lighting according to the passage?

A. Most lightning flashes take place inside a cloud.

B. About 2,000 thunderstorms occur above the earth every minute.

C. People can seldom see lightning flashes running between two clouds or between the earth and a cloud.

D. The thunderstorms happening above the earth can provide enough power to produce about 100 lightning strikes every second.

29. What does the word “ spark” in the last paragraph probably refer to ?

A. Cloud

B. Rain

C. Thunderstorm

D. Lightning flash

30. What does the passage imply?

A. Seeing is believing.

B. We should never trust what we see or hear.

C. People may easily make mistakes in their understanding of nature.

D. Children sometimes know more about nature than their parents do.

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第2题

Whether we want it or not we are all greedy by nature. From the moment we are【C1】______and to the last day of our life we【C2】______have an unsatisfied hunger to【C3】______more than we have. Greed is a way for us to take care of our needs and to make sure that we have enough in life. If you do not【C4】______me then look at any child Children and especially babies do not have any social norms that they have to【C5】______. All of their desires are engraved in them from birth. No matter【C6】______it is a toy or extra 5 minutes of hugging with Mommy or Daddy, children do not want to【C7】______it with anybody. As parents we teach them that it is good to share and not to be【C8】______, however generosity does not come【C9】______. It is a fact that generous people are【C10】______in life, they feel that their life is more meaningful and they【C11】______it more We often【C12】______generosity with money and wealth; however this is just the【C13】______of the iceberg. Being generous does not only【C14】______leaving a big tip at a restaurant or buying the most expensive gifts for Christmas. Generosity is all about giving and you can give your time, attention, love, help, and a smile【C15】______you can give money and【C16】______. Cultivating the spirit of generosity can be an eye-opening【C17】______for you because you will see in how many areas of your life you werent generous enough.【C18】______you open your heart to the world around you and start giving more to it then you will【C19】______how much more you will receive【C20】______.

【C1】

A．sleepy

B．born

C．employed

D．fired

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第3题

Every geologist is familiar with the erosion cycle. No sooner has an area of land been raised alive sea-level than it becomes subject to the erosive forces of nature. The rain beats down on the ground and washed【51】the finer particles, sweeping them into rivulets and then into rivers and out to sea. The frost freezes the rain water in cracks of the rocks and breaks【52】even the hardest of the constituents of the earth's crust. Blocks of rock dislodged at high levels are brought down by the force of gravity. Alternate heating and【53】of bare rock surfaces causes their disintegration. In the dry regions of the world the wind is a powerful force in removing material from one area to another. All this is natural. But nature has also provided certain defensive forces. Bare rock surfaces are in【54】course protected by soil itself dependent initially on the weathering of the rocks. Slowly【55】surely, different types of soil with differing "profiles" evolve the main types depending primarily on the climate. The protective soil covering, once it is formed, is held together by the growth of vegetation. Grass and herbaceous plants,【56】long, branching tenuous roots, hold firmly together the surface particles. The【57】is true with the forest cover. The heaviest tropical down- pours beating on the leave of the giant trees reach the ground only【58】spray, gently watering the surface layers and penetrating along the long passages provided by the roots to the lower levels of the soil. The soil, thus protected by grass, herb, or trees, furnishes a quiet habitat for a myriad varied organisms-earth-worms that importantly modify the soil, bacteria, active in their work of converting【59】leaves and decaying vegetation into humus and food for the growing plants. Chemical action is constantly taking【60】. Soil acids attack mineral particles and salts in solution move from one layer in the soil to another.

(51)

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第4题

【T18】

A.BRING ABOUT

B.A MAJOR FACTOR

C.SOAK UP

D.KEEN TO A.CHILDREN【T13】______A-CHARACTERISTICS IS SCHOOL

B.A-TYPE PARENTS USUALLY【T14】______A-TYPE OFFSPRING

C.BEING TOO【T15】______WIN CAN HAVE DANGEROUS CONSEQUENCES

D.IT IS LIKELY TO BECOME【T16】______ PERSONALITY IS TO A LARGE EXTENT INHERENT—【T17】______.BUT THE ENVIRONMENT MUST ALSO HAVE A PROFOUND EFFECT, SINCE IF COMPETITION IS IMPORTANT TO THE PARENTS, 【T18】______IN THE LIVES OF THEIR CHILDRE

N.ONE PLACE WHERE【T19】______, WHICH IS, BY ITS VERY NATURE, A HIGHLY COMPETITIVE INSTITUTIO

N.TOO MANY SCHOOLS ADOPT "THE WIN AT ALL COSTS" MORAL STANDARD AND MEASURE THEIR SUCCESS BY ACHIEVEMENTS.THE CURRENT PASSION FOR MAKING CHILDREN COMPETE AGAINST THEIR CLASSMATES OR AGAINST THE CLOCK PRODUCES A TWO-LAYER SYSTEM, IN WHICH COMPETITIVE A-TYPES SEEM IN SOME WAY BETTER THAN THEIR B-TYPE FELLOWS.【T20】______:REMEMBER THAT PHEIDIPPIDES, THE FIRST MARATHON RUNNER, DROPPED DEAD SECONDS AFTER SAYING:"REJOICE, WE CONQUER!"

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第5题

【T19】

A.BRING ABOUT

B.A MAJOR FACTOR

C.SOAK UP

D.KEEN TO A.CHILDREN【T13】______A-CHARACTERISTICS IS SCHOOL

B.A-TYPE PARENTS USUALLY【T14】______A-TYPE OFFSPRING

C.BEING TOO【T15】______WIN CAN HAVE DANGEROUS CONSEQUENCES

N.ONE PLACE WHERE【T19】______, WHICH IS, BY ITS VERY NATURE, A HIGHLY COMPETITIVE INSTITUTIO

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