Geologists have been studying volcanoes for a long time.Though they have learned a great deal,they still have not discovered the cause of volcanic action.They know that the inside of the earth is very hot,but they are not sure exactly what causes the great heat.Some geologists have thought that the heat is caused by the great pressure of the earth’s outer layers.Or the heat may be left from the time when the earth was formed.During the last sixty years scientists have learned about radium,uranium,thorium,and other radioactive elements.Many scientists now believe that much of the heat inside the earth is produced by radioactive elements.
Whatever the cause of the heat may be,we do know that the earth gets hotter the farther down we dig.In deep mines and oil wells the temperatures rise about 1°F for every 50 feet.At this rate of the temperature 40 miles below the earth’s surface should be over 4 000°.This is much hotter than necessary to melt rock.However,the pressure of the rock above keeps most materials from melting at their usual melting points.Geologists believe that the rock deep in the earth may be plastic,or puttylike(油灰狀的).In other words,the rock yields slowly to pressure but is not liquid.But if some change in the earth’s crust releases the pressure,the rock melts.Then the hot,liquid rock can move up toward the surface.
小題1:The cause for the great heat inside of the earth is______.
A.great pressure of the earth’s outer layers
B.the heat left from the time when the earth was formed
C.radioactive elements giving out heat
D.not sure
小題2:According to the passage,______ prevents most rock from melting at its usual melting points.
A.the pressure of the rock itself
B.the pressure of the rock above
C.the pressure of the earth’s outer layers
D.the heat given out by some radioactive elements
小題3:According to the passage,which of the following is NOT true?
A.The farther down,the hotter the earth gets.
B.The rock deep in the earth is liquid.
C.When the pressure releases from the earth’s crust,the rock melts.
D.Rock would be melted at 4 000°.

小題1:D
小題2:B
小題3:B

小題1:作者在回答這個(gè)問(wèn)題,用的都是“或許”“有些科學(xué)家”的字詞,并沒(méi)有把握。
小題2:“However,the pressure of the rock above keeps most materials from melting at their usual melting points.”一句給了我們答案。
小題3:“In other words,the rock yields slowly to pressure but is not liquid.”一句說(shuō)明在地球里面的巖石并不是液體,只有地球釋放了這種壓力,它們才以液體的形式涌向地球表面。
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D.a(chǎn) waste of time he could have spent on study
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Everywhere man is altering the balance of nature.He is facilitating the spread of plants and animals into new regions, sometimes deliberately, sometimes unconsciously.He is covering huge areas with new kinds of plants, or with houses, factories, slag-heaps and other products of his civilization.He exterminates some species on a large scale, but favours the multiplication of others.In brief, he has done more in five thousand years to alter the biological aspect of the planet than has nature in five million.
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小題1:The following examples except ________ reflect man altering the balance of nature.
A.man is covering huge areas with new kinds of plants
B.man is facilitating the spread of animals into new regions.
C.man is killing some species on a large scale
D.man is getting to know the importance of keeping the balance of nature.
小題2:What had a piece of Canadian waterweed cause?
A.Eastern Australian was overrun with forests.
B.Half the waterways of Britain blocked for a decade.
C.In parts of central Africa, the land reduced to a semidesert.
D.Disease-sleeping has been caused.
小題3:What have spread diseases?
A.Disease-sleeping sickness.B.Measles.
C.Improved communications.D.Malaria.
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A.some common and hardy kind of bird multiplies
B.rare kinds multiply
C.a(chǎn)ll bird multiply
D.no bird multiply
小題5:The main idea of the passage is _________.
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B.that man has foreseen the consequences of altering the balance old nature
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This comes after a national law was passed to give prison sentences to people who desert cats or dogs.
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“It’s good to do whatever we can for our animals who in exchange for a little love fill our existence with their attention,” she told a Rome newspaper.
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“Rome has tried to protect fish more than anywhere else in the world. It stands out for recognizing that fish are interesting animals who deserve our respect and compassion every bit as much as dogs and cats and other animals,” said Karin Robertson, a director of the People for the Ethical Treatment of Animals.
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A.help improve fishing environment
B.guarantee better conditions for goldfish
C.stop people from catching goldfish
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A.exchanges with other cities
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