March 14 is the anniversary (纪念日) of Pi. Founded in 1988 by physicist Larry Shaw. March 14 was selected because 3.14 means the first three numbers of Pi, and it also happens to be Albert Einstein’s birthday. The first Pi Day celebration took place at Exploratorium in San Francisco. However, this day became a formal international holiday until 2009.
It is said that Archimedes, the ancient Greek mathematician, was the first one to accurately calculate (计算) Pi. In 1965, the British mathematician John Wallis found that Pi is equal to the product of infinite fractions (无穷分数的乘积). In 2015. scientists at Rochester University found the same formula (公式) for Pi.
Pi is represented (代表) by the Greek letter π. It is about 3.141592654, representing the ratio of the circumference to the diameter (周长与直径之比). In daily life, 3.14 is usually used to represent Pi. And 10 decimal (小数的) places 3.141592654 is enough to deal with the general calculation. Even if engineers or physicists want 10 make more correct calculation, at best. They only need to take values to hundreds of decimal places.
In maths, this infinite number is rather important. Pi has been calculated 10 more than 1 trillion (万亿) decimal places, but the mathematicians don’t plan on stopping there. The appearance of computer makes the calculation of π value develop rapidly. In August 2010, Shigeru Kondo, a Japanese computer wizard (奇才), used cloud computing to calculate Pi to 5 trillion decimal places. Then from October 2011, he spent about a year to calculate Pi to 10 trillion decimal places, setting a Guinness world record.
1. What’s the connection between March 14 and Pi Day?| A．They have nothing in common. | B．They have the same three numbers. |
| C．March 14 is the birthday of Einstein. | D．A meeting on Pi was held on March 14. |
| A．Albert Einstein | B．Archimedes | C．John Wallis | D．Shigeru Kondo |
| A．decimal places | B．an infinite number | C．correct calculation | D．a mathematical record |
| A．π is about 3.141592654. |
| B．The anniversary of Pi is a Japanese holiday. |
| C．John Wallis is an English mathematician. |
| D．Shigeru Kondo is the most successful in calculating Pi. |
| A．discovery | B．use | C．development | D．calculation |
相似题推荐
【推荐1】Everyone has eaten instant noodles (方便面). It is very easy to cook it instantly by putting the noodles into the boiling water and adding in ingredient packets, together with other food like eggs or vegetables. However, have you ever wondered whether this is the correct way of cooking it?
When you first take out the noodles from the packaging, you will notice that the noodles are joined together nicely as a piece. In order to make the noodles joined together nicely side by side, it needs some form of wax coating (石蜡涂层) to achieve an attractive instant noodles in front of us.
However, researches have shown that the layer of wax coating on the noodles is quite harmful to our body and we should not eat it too often. It is advisable to have a break of 2—3 days before we start to eat another packet of instant noodles as our body need about 3 days to clear that layer of wax coating away from our body system. Do you know the danger of having too much wax coating stored in our stomach? It will lead to CANCER.
There are two key points to take notes while preparing instant noodles: (1) Wash the instant noodles with warm water first, stir it and pour away the water containing the wax coating. (2) Repeat Step 1 and try to stir the noodles again to wash away the wax coating on the noodles before cooking it in a new pot of water.
Hope this article will help you when you choose to eat instant noodles.
1. The function of the wax coating in the instant noodles is to ________.| A．make the noodles more delicious and tasty |
| B．make it easier to cook for the consumers |
| C．make the instant noodles healthier and more attractive to the consumers |
| D．make the noodles joined in a piece and avoid them sticking together |
| A．The hidden dangers of the instant noodles. |
| B．The way of how our body clears the wax coating. |
| C．How to cook instant noodles. |
| D．Researches on advantages of the wax coating. |
| A．去除 | B．包含 | C．储存 | D．需要 |
| A．To tell us the dangers of instant noodles. |
| B．To tell us how to cook instant noodles. |
| C．To tell us something about the layer of wax coating on the noodles. |
| D．To tell us how to eat instant noodles safely and healthily. |
There are certain sports that are played individually (各自地). They help you build confidence and the spirit to win, and teach you how to “face” victory. But, most of the time, team sports stand above them. They not only train you in body, but also in emotion, social communication and morality (道德). The word ‘‘team” has a deep meaning.
They keep your body in shape and save you from problems such as high blood pressure, heart disease and weak bones.
Team sports help people to develop the ability to listen to each other.
As Henry Ford once said, “If everyone is moving forward together, then success takes care of itself!”
| A．Team sports help a man to become social. |
| B．Women should especially take an active part in team sports. |
| C．From playing team sports, students can learn what teamwork is. |
| D．In a team sport, two or more players work together towards one purpose. |
| E．Everyone must agree with the fact that speech is silver, but silence is golden! |
| F．It doesn’t simply mean a collection of players, but a group of different minds and values. |
【推荐3】Beijing Opera, also called Peking Opera, is our national opera. It came into being after 1790 and has a history of over 200 years. Its music and singing came from Xipi and Erhuang in Anhui and Hubei. The Guangxu Emperor and Emperor Dowager Cixi were also crazy about Beijing Opera and helped develop the art form.
There are four main roles in Beijing Opera: Sheng, Dan, Jing and Chou. Sheng is the leading male (男性) actor. For example, a Wusheng is a soldier or fighter. A Xiaosheng is a young man. A Laosheng is an old man. Dan is the female(女性) role. Jing, mostly male, is the face-painted role and Chou is the comedy actor or clown(小丑).
Beijing Opera is full of famous stories, beautiful facial paintings, and wonderful gestures and fighting. Some of the stories are from the history book, but most of them are from the famous novels. The people in the story usually have some disagreements. They become angry, unhappy, sad and lonely. Sometimes they are nervous and worried. Then they find a way to make peace. The stories usually end with happiness and laughter and people are all happy in the end.
Beijing Opera is an important part of Chinese culture. In China, it used to be popular with old people while young people didn’t like it very much. However, more young people are becoming interested in it nowadays. And more people around the world are learning about Beijing Opera’s special singing, acting and facial paintings.
1. Beijing Opera’s singing is from _______.| A．Anhui and Hubei | B．Beijing and Anhui | C．the history book |
| A．stories | B．roles | C．paintings |
| A．honest | B．funny | C．serious |
| A．Peking Opera is full of different gestures and fighting. |
| B．There are only four roles in Beijing Opera. |
| C．People around the world are all learning about Beijing Opera. |
| A．Beijing Opera is a symbol of Chinese culture. |
| B．Beijing Opera is becoming the most popular in the world. |
| C．Nowadays young people like Beijing Opera more than old people. |
【推荐1】There are a lot of advantages of being tall besides being able to reach the top shelf without a step ladder. More cash? That’s right: tall men earn more money, reports LiveScience. On the other hand, there is also a huge disadvantage. According to a new study from the University of California Riverside, tall people may be more likely to develop cancer.
Leonard Nunney, a researcher at UC Riverside, reviewed four large population studies about the height and cancer. Nunney studied more than 10,000 cases of cancer, and when he looked at the result given a person’s height, he found that the cancer risk rises by 10 percent for every four inches above the average height a person is --average being 5’4’’ for women and 5’9’’ for men.
“If you were comparing a five-foot guy to a basketball player who’s over seven feet tall, then that basketball player would have around twice the risk of cancer across the board,” he said.
In the study, which was published in Proceedinds of the Royal Society B, Nunney explained that one possible reason why tall people have an increased risk of cancer may be because of the simple fact that they have more cells (细胞) in their bodies. The more cell division happens in you, the greater the chances that cells will lead to turnour (肿瘤) growth.
Nunney found that the connection between the height and cancer risk was nearly the same with 18 out of the 23 types of cancer he tracked. He also discovered that skin cancer risk had an unexpectedly strong relationship with the height. And taller women had an increased risk of thyroid (甲状腺) cancer, as well.
1. What can we learn from the first paragraph?| A．Short people are healthier than taller ones. |
| B．There are many disadvantages of being tall. |
| C．Tall people are more worried about money. |
| D．Tall people may be more successful in a work place. |
| A．The number of their cells is larger. |
| B．Their cells are weaker than others’. |
| C．They exercise less because of the height. |
| D．They have to bow their heads more often. |
| A．all types of cancer are affected by the height |
| B．tall people are more likely to have skin cancer |
| C．the height is the main part in causing cancer |
| D．tall women are at a lower risk of developing cancer |
| A．ask tall people to see doctors | B．show people a new discovery |
| C．advise people to control the height | D．compare tall people with short ones |
So what did people do before there were maps? Well, it was quite easy to use natural signs like mountains and rivers if you were travelling on foot or riding a horse. People took small boats down rivers and followed coastlines. And it was much more logical (合理的) to use time, not distance, to measure (计量) journeys: the next village is a three-hour ride, for example.
In fact, in the earliest maps, people didn't draw landmarks. They drew the stars. It was very easy to see the night sky and use it for navigation (航行). The sky was a lot clearer before the light pollution from cities that we have today. When towns and cities were built, people drew road maps which gave correct distances and directions.
The London Underground was opened in 1863 and it also used a road map style. But a man called Henry Beck realized that travelling by train wasn't the same as driving your car across London. Passengers only needed to know which stations to change at. His new design (设计) for the Underground map wasn't very popular with the train companies at first. But the passengers loved it and in 1933, 700,000 copies were printed.
These days, of course, you can ride a bike, drive a car or go through a forest and know where you are exactly, using a GPS. It's really difficult to get lost!
1. What was drawn in the earliest maps?
| A．Stars. |
| B．Landmarks. |
| C．Cities and towns, |
| D．Mountains and rivers. |
| A．Around 15th and 16th centuries. |
| B．When people began to travel by train. |
| C．When people began to travel by sea. |
| D．When cities and towns appeared. |
| A．A GPS helped people to travel long time ago. |
| B．Ancient people could travel on a horse without maps. |
| C．The sky was polluted by light before cities were built. |
| D．Henry Beck's map wasn't popular with the passengers. |
| A．Maps have a long history. |
| B．We never get lost these days. |
| C．We can't travel without maps. |
| D．Henry Beck designed a new map. |
【推荐3】A study in September has added excitement in the brain science area. In the study, volunteers had electrical stimulation (刺激) in their brains. The study found their memory and problem-solving abilities got better for at least a month. The stimulation was painless and could lead to future treatments (治疗) for memory. It can even help students with their future exams.
Volunteers in the study did better in both remembering words and working out memory-based problems. In the test, they wore a cap and it was connected to electrical currents (电流). Wearing the cap twenty minutes a day was enough to help people remember words better. The volunteers could retell more words a month later.
Working memory is connected to problem-solving and decision-making abilities. Low frequency (频率) stimulation of the brain can help boost working memory. For example, volunteers also did better in taking notes after the stimulation.
The brain training industries are worth millions of dollars. Players are interested in improving their abilities by doing memory exercises. The future is wide open if it is tested to be successful and safe in treatments.
1. According to Paragraph 2, who is likely to take the electrical shocks?| A．A man who wants to remember everything. | B．A boy who wants to get higher marks. |
| C．A woman who loves wearing caps. | D．A girl who can solve problems quickly. |
| A．They remembered the number of the words. |
| B．They needed to retell the words after a month. |
| C．They got 30 minutes of electrical stimulation a day. |
| D．They wore a cap that can help them with their exams. |
| A．make ... weaker | B．make ... worse |
| C．make ... harder | D．make ... better |
| A．The future of electrical stimulation is quite bright. |
| B．Lots of players show interest in brain training industries. |
| C．Low frequency stimulation didn’t work on the volunteers. |
| D．The volunteers tested their working memory by taking notes. |
| A．Working memory gets better when wearing caps. |
| B．Brain training industries spent millions of dollars. |
| C．The electrical stimulation helps people in memory. |
| D．All Students want electrical stimulation for exams. |
【推荐1】I'm Jerry. I am a tidy boy. In my room, the books are always on the desk. My computer game is always there, too. My shoes are always under the bed. My schoolbag is always on the sofa. I am tidy but my dog, Coco, is not. Look at my room. It is in a mess now. The books are everywhere-on the bed, on the sofa and under the desk. My computer game is on the bed. My shoes are on the sofa. Where is my schoolbag? Oh, it's under the bed. Where is Coco? Is it under the bed? Is it under the sofa? No, it is not in the room now.
1. The underlined word "there" refers to “________”.| A．on the sofa | B．under the desk | C．on the bed | D．on the desk |
| A．it is always tidy |
| B．it is Jerry's cat |
| C．it is not in the room now |
| D．it is under the sofa now |
【推荐2】I am Kevin. This is my schoolbag. A photo of my family and some English books are in it. And a pencil box, too. Is this pencil box purple? No, it is orange. It's my pencil box. What's in it? A ruler, a pencil and a pen are in it. The ruler is blue and red. The pencil is black and white. It is not my pencil. Look! That girl is my friend Lucy. It is her pencil. That boy is my cousin, Tim. I find his green pen in my pencil box. His phone number is 789-5603. I lost my watch in the morning. I must find it. My telephone number is 780-9603.
1. What can't you see in the schoolbag?| A．A photo. | B．A watch. | C．some books. | D．A pencil box. |
| A．Orange. | B．Blue. | C．Green. | D．Purple. |
①a ruler ②an eraser ③a pen ④a pencil
| A．①② | B．②④ | C．①③④ | D．②③④ |
| A．780-5693 | B．780-9603 | C．798-5603 | D．789-5603 |
【推荐3】An Unforgettable Experience
It was the week before Christmas, and there were a lot of people waiting in a long queue at the post office hall. It seemed that no one was moving. I came to the self-service machine where the queue was much shorter.
I don’t like self-service because I’m not good at it. The machine always asks me something I don’t know how to answer. I hate this. I like the old-fashioned way: hand to hand, human to human. I think it is fast and friendly.
The woman in the front of the queue was clicking away at the screen. And the clicks were surprisingly loud. There were many signs of hesitation(犹豫) on her part. I felt sorry for her: The machine could smell fear and nervous. The next person took a long time, too. I breathed deeply. By the time it was my turn, I was so nervous that I felt the beat of my heart.
I felt a growing pressure and I tried to minimized (减少) the seconds between clicks. Finally it was time to slide in a credit card. The machine didn’t take it. “Trying putting it in the other way,” the gentleman behind me suggested. No good.
“I’ve got a different card,” I said, and looked for it in my handbag, beginning to sweat. The machine wanted a PIN (个人密码), but not the one I suggested.
“Start over,” I clicked; I tried the first card again.
Oh, no. I had to start all over again.
“I’m sorry,” I said, looking back, embarrassed. “You all go ahead.”
“Don’t give up,” said the nice man behind me. “Try it again. We’re all friends here, right?”
Seeing smiling on their face, I tried again, clicked carefully and introduce my credit card as if I were presenting it to the queen. Finally, I made it!
I couldn’t have been happier. Everyone burst into applause (鼓掌). Comfort and joy!
1. Before Christmas the post office ________.| A．was very large | B．was very busy |
| C．got a new machine | D．had a party at the hall |
| A．She felt a little bored. | B．She felt very relaxed. |
| C．She felt a little excited. | D．She felt very nervous. |
| A．He encouraged the author. |
| B．He laughed at the author. |
| C．He did it for the author. |
| D．He rushed the author. |
【推荐1】Computers are useful in people's lives.They can help people save much time to do much work.Today more and more(越来越多的)families have computers，but some of them don't know how to use their computers properly.Here is how：
Keep your computer in a cool place.
Make sure that the keyboard and the screen are not too high or too low for you.
Do not drink or eat when you are near your computer.Any food or water in the keyboard is bad for your computer.
Make sure the screen is not too close to your eyes.Some people use different glasses when they use computers.
Keep the screen clean and do not have it too bright(明亮的)．A dirty screen and a very bright screen are both bad for your eyes.
1. Computers are useful because ______.| A．they can do many things | B．many families have computers |
| C．many people learn to use it | D．they can bring people good health |
| A．Three. | B．Four. | C．Five. | D．Six. |
| A．How important the computer is. | B．How to clean the house. |
| C．How to keep healthy. | D．How to use the computers properly. |
What is a gentleman?
What is a lady? Boys tell us what they think a lady is:
1. This article tells us .
| A．how to be a lady/gentleman as a student |
| B．Which school has the most ladies/gentlemen |
| C．Where a lady/gentleman usually goes at school |
| D．What students think a lady/gentleman should be like |
| A．Huang Xiaoyu | B．Chen Tingting |
| C．Wu Yifan | D．Wang Lichao |
| A．Clever, shy and kind | B．Clever, quiet and kind |
| C．Beautiful, shy and kind | D．Beautiful, quiet and kind |
| A．Pretty and quiet girls | B．Pretty but not quiet girls |
| C．Clever and kind boys | D．Clever but not kind boys |
| A．Here’s what teachers think | B．Here’s what students think |
| C．Girls have their ideas | D．Boys have their ideas |
【推荐3】Jennifer Bricker was born on October l, 1987 in Romania without legs. An American family adopted her. Jennifer didn’t have legs, but her new parents, the Brickers, never let this stop her from going for her dreams. They always said to her, “Never say you can’t! You can do anything if you work hard.”
In the Brickers’ eyes, Jennifer was no different from their three other sons. They asked Jennifer to play many kinds of sports like her brothers. Jennifer could play volleyball, softball and basketball, but Jennifer loved gymnastics（体操）best. Her favourite star was Dominque Moceanu, Jennifer often watched her on TV with her father. She wanted to be a gymnast like Dominque.
As Jennifer got older, she began to take part in gymnastics competitions（比赛）.She worked hard and did really well. Jennifer and her family always believed she could do whatever she wanted to. Her positive attitude（积极乐观的态度）and hard work made her dream come true.
1. Jennifer’s birthday is in ________.| A．September | B．October | C．November | D．December |
| A．Volleyball. | B．Softball. | C．Basketball. | D．Gymnastics. |
| A．Jennifer was born in the US. |
| B．There are five people in Jennifer’s new family. |
| C．Jennifer’s new parents are nice to her. |
| D．Jennifer got to know Dominque on the Internet. |
| A．It’s not easy to be a successful gymnast. |
| B．Every child is great in their parents’ eyes. |
| C．A woman without legs made her dream come true. |
| D．It’s good for parents to let the children go for their dreams. |
