题型：阅读选择 题类： 难易度：普通
浙江省绍兴市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.
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.
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clear / what / filled with / interviewed / looked up / swim / how |
Childhood memories are unforgettable. The first bicycle ride, the first {#blank#}1{#/blank#} in the pool, and the beautiful wallpaper are deeply planted in our minds. But can they be trusted? In other words {#blank#}2{#/blank#} reliable (可靠的) are our memories?
In a study in 2024, Peterson and his team {#blank#}3{#/blank#} children ages 4 to 13 about their earliest memories and re-interviewed them two years later. They found that events {#blank#}4{#/blank#} feelings were easier to stay. Besides, if the child had a {#blank#}5{#/blank#} memory rather than a confused (模糊的) one, he might remember it better.
We see many things like colors, lights, buildings with our eyes. But can you protect (保护) your eyes well? {#blank#}1{#/blank#}
Let eyes have a good rest.
Many people need to look at a computer when they work or study. That puts a lot of pressure (压力) on their eyes. So every 20 minutes, you should let your eyes have a good rest for around 20 seconds. {#blank#}2{#/blank#}
Wear a sun hat or sunglasses.
{#blank#}3{#/blank#} They can be bad for eyes, so it's best to get in the habit of protecting them from an early age. Wearing a sun hat or sunglasses is the best way to protect your eyes.
Have eye-friendly food.
You can also protect your eyes by eating some eye-friendly food.{#blank#}4{#/blank#}
Have a good sleep.
{#blank#}5{#/blank#} You may think you are doing nothing when you're sleeping. But it's the time for your body to rebuild and repair (重建和修复). At night, your eyes keep cleaning out the bad things that come in during the day.
根据材料内容，从下面五个选项中选出能填入文中空缺处的最佳选项，使文章意思通顺、内容完整。
A Green vegetables and fish are good to keep our eyes healthy. B. There are some bad rays from the sun. C. Here are some ways about how to look after your eyes. D. Make sure you have a good sleep at night. E. During the rest, you should look out of the window. |
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