
Tardigrades,which are known as space bears,are able to survive for up to 30 years without food or water,and endure temperature extremes of up to 150 degrees Celsius,the deep sea and even the frozen space.
Researchers found that their astonishing abilities would protect them from disasters which would wipe out all life on Earth.In fact,the only forces capable of harming tardigrades,such as an exploding star or a deadly gamma ray burst,will not happen before our own Sun dies.
"Life on this planet can continue long after humans are gone," said Dr.Rafael of the Department of Physics,tardiprades are as close to indestructible as it gets on Earth,but it is possible that there are other resilient (有承受力的) species examples elsewhere in the universe.In this context,there 1 S a real case for looking for life on Mars and in other areas of the solar system in general,If tardigrades are earth's most resilient species,who knows what else is out there."
The micro animals living In water can live for up to 60 years,and grow to a maximum size of 0.5mm.The only real threat to their existence would be from a destructive event which would cause Earth's oceans to boil away.But the scientists discovered that there are only a dozen known asteroids (小行星) and dwarf planets with enough mass to cause the oceans to boil if they struck the Earth and none are on a collision course with our planet.Smaller space rocks would not harm tardigrades.
Dr.David,Post-Doctoral Research Associate in the Department of Physics at Oxford University said: "To our surprise,we found that although large asteroid impacts would be disastrous for people,tardigrades could be unaffected.Therefore it seems that life,once it gets going,is hard to wipe out entirely.Huge numbers of species,or even entire genera may become extinct,but life as a whole will go on."
In highlighting the resilience of life in general,the research broadens the scope of life beyond Earth,within and outside of this solar system.
Professor Abraham,chair of the Astronomy Department at Harvard University,said the research proved that life could survive in even the harshest environment. "Organisms with similar tolerances to radiation and temperature as tardigrades could survive long term below the surface in these condition."
(1)What does "this planet" in paragraph 3 refer to? BB
A.Sun.
B.Earth.
C.Mars.
D.The dwarf planet.
(2)What can we learn from paragraphs 3 and 4? AA
A.There may exist more resilient species in other planets.
B.Na other species are stronger than tardigrades on the earth.
C.Tardigrades can be found in other areas of the solar system.
D.Tardigrades will be destroyed by space rocks hitting the earth.
(3)Dr.David and Professor Abraham might agree that AA.
A.life will continue however bad the situation is
B.it is necessary to explore beyond the solar system
C.surviving below the surface s harder than imagined
D.asteroid impacts may cause the destruction of tardigrades
(4)What's the purpose of the passage? BB
A.To explore a study method.
B.To introduce a new research finding.
C.To provide a possible way 10 live in outer space.
D.To offer new means to survive tough environment.
【考點】說明文.
【答案】B;A;A;B
【解答】
【點評】
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發布:2024/4/20 14:35:0組卷:1引用:2難度:0.5
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1.Most of us spend our lives seeking the natural world.We go fishing,sit in the garden,have a picnic,live in the suburbs or go to the seaside.The most popular leisure activity in Britain is going for a walk.When joggers jog,they don't run on the streets.Every one of them tends to go to the park or the river.
But despite this,our children are growing up naturedeprived(剝奪).I spent my boyhood climbing trees.These days,children are robbed of the ancient freedom,due to problems like crime,traffic,the loss of the open space and strange new ideas about what is best for children,that is to say,things that can be bought,rather than things that can be found.
The truth is to be found elsewhere.A study in the US:families had moved to better housing and the children were assessed for ADHD—Attention Deficit Hyperactivity Disorder(注意力缺陷多動癥).Those whose accommodation had more natural views showed an improvement of 19%;those who had the same improvement in material surroundings but no nice view improved just 4%.
ADHD is one of the great problems of modern childhood.One study after another indicates that contact with nature gives huge benefits to ADHD children.However,we spend money on drugs rather than on green places.
The life of old people is measurably better when they have access to nature.The increasing concern for the growing population of old people is in quality rather than quantity of years.And study after study finds that a garden is the single most important thing in finding that quality.Even problems with crime and aggressive behaviour are reduced when there is contact with the natural world.
We need the wild world.It is essential to our wellbeing,our health and our happiness.
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2.It is widely believed that biodiversity(生物多樣性)is promoted to save species.But in reality species exist only as part of ecosystems and cannot survive unless their ecosystems are protected along with as much as possible of the diversity they contain.
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For a number of environmentalist,protecting the world's 25 biodiversity hotspots(熱點地區)is critical to saving habitats and species.But many hotspots are endangered already,having lost up to three-quarters of their original plants.
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