题型:阅读选择 题类: 难易度:普通
浙江省诸暨市浣纱初级中学2024-2025学年九年级上学期9月月考英语试题
If you've ever used pi in math class, you probably used the number 3.14. In fact, the number for pi is much longer. Pi is called an irrational number (无理数) because the digits (数位) after the decimal point (小数点) never end or repeat.
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>In 2015, a young man from India named Rajveer Meena set a world record by memorizing 70,000 digits of pi. But pi is much longer than that.
On Pi Day ( March 14th) this year, a company called Solidigm said it calculated (计算) pi to105 trillion (万亿) digits. And the 105 trillionth digit is 6. It broke the record for how many digits of pi we know.
Pi is really useful for circles in math. It helps us connect the circumference with the diameter of a circle.
Even NASA scientists use pi for their work of studying space. But they only need about 15 digits of pi for their calculations.
Calculating pi also has another important use. It's how scientists test new computer programs and data storage systems (数据存储系统).
Solidigm's calculation of pi took around 75 days to finish. The company's owner Brian
Beeler said that the achievement needed a lot of work. They had to plan the calculation very carefully.
This isn't the first time that Solidigm has calculated pi. In 2022, Google Cloud calculated 100 trillion digits of pi. Solidigm matched that in 2023.
In the future, we'll keep finding more and more digits of pi. We'll never be able to calculate all the digits of pi because it goes on forever. But it still helps us see how great computers can be.
Do you know Kate Smith? {#blank#}1{#/blank#} She is English. Her family are in China now.{#blank#}2{#/blank#} Her mother is an English teacher in that school, too. Her brother David is a student in our school. He is learning Chinese. {#blank#}3{#/blank#}They like China. {#blank#}4{#/blank#} In this photo, her parents are on the sofa. David is in his room.{#blank#}5{#/blank#} She is in her room.
A. Where is Kate? B. She is my good friend. C This is a photo of her family. A. She is my grandmother. B. He often helps me with my English. C. Her mother is a teacher. D. Her father is an English teacher in No. 2 Middle School. |
Home town: Venice, Italy Population: about 343 thousand Famous places: La Fenice Opera House, St. Mark's Square Venice has a history of more than 1500 years. It's called River City. People travel through the city not by car or bus but boat. It's also Marco Polo's home town. — Franco | Home town: Montreal, Canada Population: about 4100 thousand Famous places: Old Montreal, Mount- Royal Park There are many famous universities, such as University of Montreal. The Mount Royal is 233 meters high. It rains a lot and no season is wetter than summer there. — Jessica | ||
Home town: Cairo, Egypt Population: about 22.8 million Famous places: the Pyramids(金字塔群), the Great Sphinx(狮身人面像) Cairo is the capital of Egypt. It's an international travel city. People can travel on a boat on the Nile River. — Nefertari | Home town: Altay(阿勒泰), China Population: about 668 thousand Famous places: the Altay Mountains, Kanas Lake A TV play has made Altay become a travel hotpot city in 2024. It is famous for its beautiful sightseeing in every season. — Zhang Xin |
Protect yourself on hazy days(雾霾天)
How much do you know about haze? Haze can also be called"smog". It's a kind of air pollution caused mainly by cars and factories.
Smog does great harm to your health. It can make you cough and cause skin (皮肤) and eye problems. Then what can you do to prevent the harm in the situation? Here is some advice you can follow.
{#blank#}1{#/blank#} Outdoor activities make you breathe deeply. As a result, you'll take in more particles which are bad for your lungs(肺).
{#blank#}2{#/blank#} If you have to go out, you'd better wear gloves, long coats and trousers, which can protect your skin. Most importantly, you must wear a mask. Paper and cotton masks cannot help you in the haze weather. Some special masks can be of great help.
Keep the indoor air clean. Most people prefer to keep the doors and windows closed on a hazy day. However, that's wrong. You can open the window slightly twice a day— at 10 am and 3 pm. {#blank#}3{#/blank#} And a wet cloth near the window can also help absorb (吸 收) the particles.
Have healthy eating habits. Scientists discover that vitamin A, C and E can greatly help protect your eyes, nose and lungs. So don't eat food with too much fat. {#blank#}4{#/blank#} Besides, try to make meals by yourself.
A. Take protective measures (措施). B. Eat more green vegetables and fruit. C. Don't exercise in the open. D. Grow some plants. E. Wear a mask. |
What else can you do to protect yourself on hazy days? {#blank#}5{#/blank#}
Welcome to the National Museum of China! The National Museum of China(NMC) is the top palace of history, art and culture. The museum was founded in 2003 and reopened in 2011. As the largest single-building museum in the world, the NMC has five floors above the ground and two floors underground. It has over 1.4 million items of collection. It helps improve cultural confidence of Chinese people and communication between China and other countries. Opening Hours ★9: 00—17: 00(Closed on Monday, last entry at 16: 00) Notice to Visitors ★Make sure you go through the security check. ★Make online appointments, 1—7 days earlier. ★Have your ID card when entering the museum. Audio Guide Rental You can pick up the audio guide player at the Service Desk in the West Hall. Please pay 140 yuan and show your ID card. |
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