Although the weather is very hot now，the carnival of ice and snow is getting closer.The preparation work for Beijing Winter Olympic Games，which are expected to begin on Feb 4，2022，has entered its final stage.In January，2021，the ice-making work on the "Ice Ribbon"，a landmark venue for the Beijing Winter Olympics，was completed.
In the Winter Olympics，where races can be won or lost by a small time gap，tiny imperfections in the ice can make all the difference. "It's not just a hunk of ice like you'd normally think of，like ice cubes sitting in your freezer，" told Kenneth Golden，a US mathematician who studies the structures of ice. "It's a much more fascinating and complex substance than people would normally think."
The first step for building any ice rink is to purify the water to remove dissolved solids like salts and minerals.Such impurities don't fit in the regular hexagonal（六邊形的）structure of ice that forms as water freezes.The more pure the water is，the more consistent the ice surface.
In addition to the need for excellence in the raw materials of ice-making，technology is also very important.As one of the most advanced technologies for winter sports venues，a carbon dioxide（CO2）cooling technology has been applied on a large scale for the Beijing Winter Olympic Games.CO2 is not new when it comes to ice-making.However，it has been gradually replaced by the man-made refrigerant，like Freon.
With increasing attention toward climate change，the old refrigerant has come into use again.As an element of the atmosphere，CO2 doesn't damage the ozone layer.Although CO2 is a greenhouse gas，its greenhouse effect is much lower than that of other synthetic refrigerants.The Winter Olympics venues adopted CO2 instead of Freon as a refrigerant in ice-making，which will reduce carbon dioxide emissions greatly.
"We believe these technological innovations will bring Beijing 2022 to spectators all over the world in a more impressive way，" told Gao Bo from the Media Operations Department of the Organizing Committee of the Beijing Winter Olympic Games.
（1）What is the result of impurities in water for ice-making？ BB
A．The water isn't able to freeze completely.
B．The quality of the ice will be affected.
C．The ice surface will be more consistent.
D．It's likely for athletes to fall on the ice.
（2）Why has CO2 cooling technology been applied for the Winter Olympic Games？ CC
A．It's the most advanced technologies for ice-making.
B．CO2 is more efficient than other refrigerants.
C．CO2 is more environmentally-friendly than Freon.
D．CO2 has already existed in the atmosphere.
（3）What is Gao Bo's attitude to CO2 being applied to ice-making？ DD
A．Unclear.
B．Opposed.
C．Doubtful.
D．Favourable.
（4）Which of the following is a suitable title for the text？ BB
A．The Beijing Winter Olympic Games Is Coming.
B．Beneath Olympic Ice.
C．The Use of Refrigerants in Olympic Games.
D．The Structure of Ice.
【考點(diǎn)】說明文．
【答案】B；C；D；B
【解答】
【點(diǎn)評(píng)】
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發(fā)布：2024/4/20 14:35:0組卷：3引用：5難度：0.6
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1．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.
Protecting habitats（棲息地）is important for keeping biodiversity.In 2003，over 102，000 habitats covering nearly 19 million square kilometres，or 11.5% of the world's land surface，were under some form of protection.Though this is a great improvement since 1962，when just 1，000 protected habitats were listed，it is still not considered enough to stop the ecocide that is endangering the world's biodiversity.
For a number of environmentalist，protecting the world's 25 biodiversity hotspots（熱點(diǎn)地區(qū)）is critical to saving habitats and species.But many hotspots are endangered already，having lost up to three-quarters of their original plants.
The poor state of most biodiversity hotspots results directly from population growth and migration（遷移） into these areas.A study found that by the mid-1990s around 1.1 billion people lived in these hotspots.Moreover，the annual population growth rate in these areas was 1.8%，higher than the global average of 1.4%.The PAI report concluded that human-related environmental changes will continue to put pressure on hotspots.Therefore，keeping biodiversity requires paying close attention to population size.
Protecting hotspots is not simply a matter of putting up fences and employing guards.The best results are achieved when local people are educated about the value of wildlife，and actually gain a share of the benefits from eco-tourism.Only then do they have a chance to see the benefits of protecting hotpots.
（1）What can we infer from paragraph 1？
A．The loss of any species can affect humans.
B．Endangered species are paid more attention to by humans.
C．Species can still survive when their ecosystems are destroyed.
D．Ecosystem protection is as important as diversity protection.
（2）What does the underlined word "ecocide" in paragraph 2 mean？
A．Ecosystem protection.
B．Reduction of the number of species.
C．Serious damage to habitats.
D．Habitats protection.
（3）What's the direct cause of the terrible state of the hotspots？
A．Population growth in hotpots.
B．Migration out of these areas.
C．Global warming.
D．The global average population growth rate.
（4）What's the author's opinion on protecting the hotspots？
A．It's simple to carry out.
B．It leads to the increase of tourists.
C．It's closely connected with local people.
D．It suggests that the local people are well educated.發(fā)布：2025/1/6 16:30:6組卷：0引用：1難度：0.5 -
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（2）What do international students staying in the United States think of the new rule？
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（4）What does the underlined phrase "in limbo" in the last paragraph mean？
A．Horrible.
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We need the wild world.It is essential to our wellbeing，our health and our happiness.
（1）According to the author，people enjoyto seek nature.
A．jogging on the street
B．running in the gym
C．shopping in the supermarket
D．sitting in the garden
（2）From the second paragraph，we can see that.
A．Children don't want to approach nature
B．children probably spend less time in nature nowadays
C．climbing trees will certainly do good to the children
D．children tend to be happier as a result of their material satisfaction
（3）In what way do people benefit from their contact with nature？
A．Children with ADHD can be cured.
B．Children's performance at school is greatly improved.
C．Problems with crime and violent behavior will easily be solved.
D．A garden nearby improves the quality of old people's life.
（4）what is the main idea of this passage？
A．Access to nature improves our life.
B．Nature treats children for ADHD.
C．Getting close to nature reduces crime.
D．Man can't live without natural areas.發(fā)布：2025/1/6 16:30:6組卷：0引用：1難度：0.5
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