Boys and girls, let’s do an experiment (实验) in today’s lesson.
What we need:
How we do the experiment:
1.Pour tag water into the glass until it is about 2/3 full.
2.Drop the egg carefully into the glass and watch it going down towards the bottom.
3.Add about five spoons of salt to the water. Test to see if the egg goes up.
4.Add more salt if the egg is still at the bottom.
The science behind it:
Things go down in the water when they are denser (密度更大的) than the water. By adding salt, we make the water denser. Once the water is denser than the egg, it goes up and floats (漂浮) on the water.
You can also try other things to see if you can have the same result.
根据语言材料内容选择最佳答案。1. What kind of lesson are the students having?
A.Maths. | B.Physics. | C.Geography. |
A.![]() | B.![]() | C.![]() |
A.The egg will on the water. |
B.The egg will in the middle of the water. |
C.The egg will go down toward the bottom. |
A.Once the egg is dense r than the water, it goes up and floats on the water. |
B.The water with salt is dense enough to make the egg float. |
C.Drop different things into the water, we can get different results. |
A.Because tap water is denser than salt water. |
B.Because the more the liquid there is, the easier it is for an object to float. |
C.Because the denser the liquid is, the easier it is for an object to float in it. |
相似题推荐
【推荐1】FSPA Music Lessons
Summer is the great time to take music lessons. Lessons can be given around a student’s vacation plans. Music lessons are one-on-one teaching based on each student’s skill level. Our teachers teach nearly every instrument and voice — whether you are a beginner or you have experience and want to improve your skills.
Music lessons are given on nearly every instrument and in voice and music theory (理论). Call the FSPA office at 810-238-1350.
Fees (费用) for a 9-week term 30-minute lessons $220. 50 45-minute lessons $330. 75 60-minute lessons $441. 00 90-minute lessons $605. 50 (Study on a weekly basis in the whole year is strongly encouraged for the development of good musical skills. ) Timetables for a 9-week term Term 1: September 4th—November 3rd Term 4: April 8th—June 8th Term 2: November 5th—January 26th Memorial Day: May 24th, closed Martin Luther King, Jr. Day: January 21st, closed Term 3: January 28th—April 6th Term 5: June 10th—August 12th Spring Break: March 25th—30th July 4th & 5th, closed |
A.One-on-one instruction. |
B.Small classes for beginners. |
C.Large classes for students of all levels. |
D.Small classes for highly skilled students |
A.$220. 50. | B.$330. 75. | C.$441. 00. | D.$605. 50. |
A.Learn music weekly in the whole year. |
B.Learn different instruments. |
C.Learn music theory every summer. |
D.Learn music for 9 weeks each year. |
A.2 | B.3 | C.4 | D.5 |
A.January 26th. | B.April 6th. | C.May 26th. | D.July 5th. |
【推荐2】
A.Speaking. | B.Reading. | C.Writing. | D.Vocabulary. |
A.Good. Keep it up! | B.Try harder! |
C.Practice makes perfect. | D.Well done! You work hard. |
A.to explain why they have passed the exam |
B.to check how much progress they have made |
C.to tell their parents what they’ve done at school |
D.to know about how they can use the grammar correctly |
【推荐3】①Since last September, primary and junior high schools have offered labor courses. That has made students realize the great importance of labor education, encouraging students to do activities such as cooking, decorating houses and volunteer work. Some students in China were given specialized homework during the winter vacation.
②Xue Youmei, a Grade 7 student, spent the winter holiday in Guangxi doing her specialized homework. Everything about village life was novel to Xue who was used to city life. She joined her family to work in a farm field planted with Chinese water chestnuts (荸荠). Xue, wearing a pair of gloves, helped her father pick up water chestnuts in the field.
③For Yang Liqiao, a Grade 6 student, the past winter holiday gave her a new identity (身份) — rubbish sorting guide. Yang wore a volunteer’s T-shirt and recorded the situation of the rubbish sorting work at her community. Yang also invited her classmates to walk around the park nearby to pick up rubbish on the ground. Yang’s father found labor activities offered students a chance to get knowledge, which was not caught at class.
④Here are two more examples about the specialized homework. To let students enjoy play-based learning, some students were asked to work with parents to decorate their homes with New Year paintings. The purpose of the task was to develop students’ new thinking and creation. And some were required to collect physics-related Chinese poems, make an analysis (分析) and draw a conclusion.
1. According to Yang Liqiao’s father, labor courses are ________.A.useless | B.strange | C.difficult | D.helpful |
A.Yang Liqiao picked up and sorted rubbish with her parents in the park. |
B.The specialized homework made students more creative and knowledgeable. |
C.Some students were required to collect chemistry-related Chinese poems. |
D.Every student did some specialized homework during the past winter holiday. |
A.①/②③④ | B.①/②/③④ | C.①/②③/④ | D.①②/③/④ |
A.How to Do Volunteer Work |
B.The Importance of Labor Education |
C.Specialized Homework for the Summer Holiday |
D.How to Develop Students New Thinking and Creation |
【推荐1】Have you heard of the word “hygge”? It’s a Danish (丹麦的) word, as well as a lifestyle practiced by Danish people. There is no English word for the exact meaning of hygge, according to Oxford Dictionaries. It might be translated into being comfortable, safe in English, but it is more than that.
Enjoying beautiful music or having a movie night is hygge. Lighting candles or making real tea in china cups—that’s hygge too. There’s nothing more hygge than sitting around a table with your family or friends, discussing the big and small things in life. Hygge focuses on the idea of making ordinary daily activities special or meaningful, according to the BBC.
For Danish people, hygge is a way of fighting the cold winter.In Denmark (丹麦), there can be up to 17 hours of darkness a day in winter, and the average temperature is around 0℃, according to the BBC. As a result, people spend more time indoors and focus on home entertaining.
Now the idea of hygge is traveling abroad and becoming popular in the world. In the United Kingdom and the United States, there are more and more hygge-themed cookbooks and lifestyle guides, as well as Danish restaurants, cafes and bars. “The rest of the world seems to be slowly waking up to what Danes have been wise to for ages,” Helen Russell, author of The Year of Living Danishly, told the BBC.
1. How does the author explain “hygge” in Para. 2?A.By telling a story. | B.By giving examples. |
C.By listing reasons. | D.By comparing different cultures. |
A.Lighting candles or making real tea in china cups. |
B.Enjoying beautiful music or having a movie night. |
C.Making ordinary daily activities special or meaningful. |
D.Sitting around the table and enjoying home entertaining. |
A.Around 5 hours. | B.Up to 12 hours. |
C.Around 10 hours. | D.Up to 17 hours. |
A.The history of the hygge. | B.The spread of the hygge. |
C.The meaning of the hygge. | D.The importance of the hygge. |
A.Popularity. | B.Warmth. | C.Happiness. | D.Wisdom. |
![](https://img.xkw.com/dksih/QBM/2022/8/3/3036661768806400/3038810918125568/STEM/fbd06b89a0504b678980f0e033f9a5d2.png?resizew=109)
A country cannot live without young people, and young people cannot live without awakening.
-Li Dazhao, 1927
In 2022, the Communist Youth League of China (the CYLC) is turning 100 years old.
In 1922, the Youth League held its first national meeting in Guangzhou, which marked its birth. Twenty-five members were chosen for the meeting from 5, 000 members across the country. Because of their belief in Marxism(马克思主义), they started the meeting on May 5th-the birthday of Karl Marx. After that, the organization changed its name to the Communist Youth League of China in 1925.
As a pioneer(先锋)of China’s youth movement, the CYLC now has more than 73.7 million members nationwide aged 14 to 28, and about 43.8 million of its members are students. Young people are the future and hope of a country and the CYLC always unites young people, bringing them closer together to work for China’s development.
Liu Lijia, a student at Beijing Normal University, said that as a Youth League member, she is always thankful to the Party and the Youth League for helping with her development. She has signed up to become a volunteer teacher in the country’s western areas. “I want to use what]have learned at the university, go to the places where I am needed the most, and devote(奉献)myself to bridging the educational gap between different areas. ” Liu said.
1. When was the Communist Youth League of China born?A.In 1922. | B.In 1925. | C.In 1927. | D.In 2022. |
A.The future of the CYLC. | B.The history of the CYLC. |
C.The belief of the CYLC. | D.The achievement of the CYLC. |
A.![]() | B.![]() | C.![]() | D.![]() |
A.发展 | B.合并 | C.团结 | D.混合 |
A.show a result | B.have a discussion | C.give a reason | D.provide an example |
【推荐3】As an ancient country with a history of more than 5000 years, China has had hundreds of traditional musical instruments, which interest the Western people too much. Here’re four to enjoy!
Erhu is a Chinese folk instrument. It is sometimes known as the “Chinese violin” because it sounds like a violin. The Moon Over a Fountain is one of the most famous pieces of erhu music created by a man who lost sight, based on a love story between a girl and himself. | |
It’s amazing that in ancient times, guzheng was used to hit the enemies. Later, it was used as a kind of instrument. At first, it had 12 strings(弦), and then a 13-string guzheng was developed. Now it usually has 21 strings. | |
Xun is one of the oldest Chinese instruments. It comes in different shapes. The most common one is egg-shaped. Each shape produces a different sound. It can be made of stone, jade(玉)and clay(陶土). | |
The horse-head fiddle is the traditional musical instrument of the Mongolian ethnic group(蒙古族). There are two strings on the horse-head fiddle. It has been played for centuries. Once a boy had a little white horse. Unluckily, it was killed by a bad guy. The boy made a musical instrument out of its body and carried it all the time. |
A.Four. | B.Twelve. | C.Thirteen. | D.Twenty-one. |
①the inventor ②the shape ③the material ④the design
A.①② | B.②③ | C.①④ | D.③④ |
A.Erhu is a Chinese instrument which is the same as violin. |
B.Guzheng was once used to make friends in ancient times. |
C.Xuns of different shapes may produce different sounds. |
D.The horse-head fiddle was invented because of a love story. |
【推荐1】Good afternoon, parents and teachers. Thank you for attending this meeting.
Last weekend, one of our students went to hospital. The student played computer games on the Internet all day Saturday without stopping to drink, eat or sleep. Finally, he became very ill.
Some students play computer games for too long. This is a serious problem. In the past, students used to play outside more often, but now they spend more time in front of computers. This is bad for their health.
Tomorrow we’ll have some experts here to talk to the students about the bad effects of playing computer games. They’ll also give some advice on how to use computers for studying.
I hope we can all work together to stop students from spending too much time playing computer games. Thank you for your time.
1. Who is attending the meeting?A.Parents. | B.Teachers. | C.Parents and teachers. | D.Students. |
A.On Saturday. | B.On Tuesday. | C.On Friday. | D.On Wednesday. |
A.They used to spend more time in front of computers. | B.They used to play outside more often. |
C.They used to help their parents. | D.They used to stay at home alone. |
A.A teacher. | B.A doctor. | C.Some experts. | D.Some policemen. |
VOLUNTEERS NEEDED If you have no good plans for your holidays, why not spend your time helping others? I think you can also learn a lot by giving help. Volunteer project: The volunteers will work in an orphanage(孤儿院) built by a group of kind women by organizing activities, teaching the kids to read, to write, to speak and also giving them moral(道德) lessons. Language: English Working time: Saturday, 2:00 p.m.—5:00 p.m. Sunday, 9:00 a.m.—4:00 p.m. Age: 18 and over Accommodation(住宿): Volunteers will stay at the guest house near the school (volunteers need to pay for the stay). |
A.once a week | B.twice a week | C.three hours a week |
A.teaching children to read |
B.giving children moral lessons |
C.cooking food for children |
Today is Sunday. It’s 7:00 in the evening here. I’m writing to tell you something about my family’s life. My mother is cooking in the kitchen. My father is watching CCTV news. That’s his favorite program. My brother is playing computer games. My dog Baby is taking the hat to me. He wants me to put it on and go out for a walk with him. What a clever dog! My little sister is practicing playing the piano. It sounds beautiful today. Outside, I can hear cars and buses coming and going quickly. Also there are some boys playing ball games. It’s really a noisy (嘈杂的) but happy evening. Do you think so? What are your family doing? I know the time here is thirteen hours ahead of (提前) that in New York. Are you up? Please write to me soon.
Best wishes!
Yours,
Dave
1. What is Dave’s brother doing?A.He is seeing a film. |
B.He is talking on the phone. |
C.He is watching his favorite TV program |
D.He is playing computer games. |
A.Because he likes the hat very much. |
B.Because the weather is too hot. |
C.Because he wants to go out for a walk. |
D.Because he thinks the hat is strange. |
A.Four. | B.Five. | C.Six. | D.Seven. |
A.Very glad. | B.Very bad. | C.Very sad. | D.Not very well. |
A.4:00 a.m. | B.5:00 a.m. | C.6:00 a.m. | D.7:00 a.m. |