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】說明文．
【答案】B；C；D；B
【解答】
【點評】
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發(fā)布：2024/4/20 14:35:0組卷：3引用：5難度：0.6
相似題
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1．The Spring Festival is the biggest festival for Chinese people all around the world.The celebration usually lasts for 15 days.There is a lot to do.
On the eve of the Spring Festival，family members get together and have a big meal.Their favourite dish on this day is dumplings.
Days before the Spring Festival，families will clean their houses.People think cleaning sweeps away bad luck.It makes the house ready for good luck.
The colour red is everywhere during the Spring Festival.People think red is a happy colour and will bring them a bright future.People wear red，too.They decorate their homes with pieces of red paper.Kids get a lot of "hongbao".It is a red paper bag with money in it.Usually，older people give younger ones "hongbao".They think it brings good luck.
The Spring Festival is the time to make everybody happy.So don't say any bad words or do anything that will bring unhappiness to other people.For instance，you'd better not say any bad words like "death".Don't break anything.People think that means your luck is running out.
Also，don't borrow or lend money on these days.If you have borrowed money，return it before the Spring Festival.
（1）What do most people do on the eve of the Spring Festival？
A．Family members gather for a big meal.
B．Friends eat dumplings together.
C．They borrow money from friends.
D．They give each other "hongbao".
（2）Why do people clean their houses days before the Spring Festival？
A．Because they enjoy cleaning.
B．Because it is believed that cleaning will sweep away bad luck.
C．Because they think it will bring happiness to others.
D．Because it is thought that cleaning brings in money.
（3）Which of the following things is NOT supposed to happen during the Spring Festival？
A．Returning money before the Spring Festival.
B．Saying bad words like "death".
C．Wearing red clothes.
D．Decorating houses with red paper.
（4）We can tell from the story that the Spring Festival is.
A．a(chǎn) time of harvest and fun
B．celebrated for one whole month
C．only celebrated in China
D．a(chǎn) time for families to get together發(fā)布：2025/1/1 6:30:1組卷：17引用：7難度：0.6 -
2．Push yourselves beyond the limits
Limits are blocks between you and your success.You will face great resistance when attempting to break through the limjye.ais.It could be fear，lack of confidence，physical disabilities，and mental block.If you desire a life of success，you must face the resistance and push yourself beyond the limits. （1）Here are tips for you to succeed.
（2）Don't wait for external motivation to make the first move.Discover your inner motivation!It could be a motivational video，articles，TED Talks，or quotes.Ensure it is something that fills you with passion and drive to get things done.Inspiration can push you forward.
Take on a little more than you think you can.Pushing past your limits means taking on newer，harder challenges.If you're not challenging yourself to do bigger and better things regularly，you're only working within what you already can do.（3）
Work on your goals a little each day.Chances are great that you need to build your empire brick by brick.That takes time and regular effort. （4）That is，there is not a day that you don't work on your big goals，at least a little bjye.ai.It can be fifteen minutes dedicated to doing one small thing that will get you closer to that big thing you want to accomplish.
Find someone who supports you and encourages you to keep going. （5）Having someone to support you can balance out the impact of any negative thinking that may limit you.It could be a life coach，friend，parent，or your wife or husband.They can help you make the push you need to get out of your comfort zone.
A．Inspire yourself.
B．Rome wasn't built in a day.
C．Discover where your passion lies.
D．A bit of assistance means much in facing resistance.
E．One good way is to adopt the approach of "No Zero Days".
F．Failure to do so will make your goals and dreams unrealizable.
G．That's a way to stay exactly where you are and make little or no progress.發(fā)布：2025/1/1 11:30:2組卷：21引用：5難度：0.5 -
3．There are all kinds of festivals （1）
the world，festivals to satisfy and please the ancestors，to honour some famous people （2）important events，and to express people's gratitude to the God for bringing （3）a year of plenty．For example，Japanese observe Obon，（4）people go to clean graves and light incense in memory of their ancestors．In India，October 2 is a national festival to honour Mohandas Gandhi，who helped India become an （5）（depend） country．And in China the Spring Festival，（6）is celebrated in January or February，is the most energetic and important （7）it is a festival that（8）（look） forward to the coming of spring．Why are all these festivals everywhere？Because during the festivals，people can get together to eat，drink and have fun with each other，（9）（forget） all the （10）（day） struggles and demands for a while．發(fā)布：2025/1/1 6:30:1組卷：25引用：2難度：0.7
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