| A bag of wind You can move more air than you might think just by blowing with your lungs（肺）. |
You'll need：  Helper，Tape，Large plastic dry cleaner's bag |
Please follow the steps：  ◆1st step：Fold over bottom of bag and close it with tape（膠帶）.Leave a small hole for clothes hanger（衣架） to go through.Then ask helper to hold bottom of bag，and see if you can blow through the small hole and fill the bag full of air with one breath. ◆2nd step：  Press air out of bag.Ask helper to hold bottom of bag again，and blow air into the small hole while keeping mouth about 25 cm from the hole. |
| What happened？The second time，you were able to blow much more air into the bag.The stream（氣流） of air you blew into the bag the second time created a partial vacuum（半真空） as it entered the bag.That pulled in a lot of surrounding（周圍的） air with it，filling up the bag. |
D
D
A．Latest news.
B．Stories.
C．Travel.
D．Science.
（2）We should pay attention to
C
C
when we blow more air into the wind bag.A．being closer to the bag the first time
B．blowing with a long breath in the first step
C．keeping 25 cm from the hole the second time
D．not taking the clothes hanger out of the wind bag
（3）Why did more air go into the wind bag the second time？
D
D
A．The people who blow held a longer breath.
B．Air inside the bag was blown out of the bag.
C．Air went into the bag by itself while no air was in it.
D．Surrounding air was pulled in the bag while blowing.
【答案】D；C；D
【解答】
【點(diǎn)評】
聲明：本試題解析著作權(quán)屬菁優(yōu)網(wǎng)所有，未經(jīng)書面同意，不得復(fù)制發(fā)布。
發(fā)布：2024/5/13 8:0:8組卷：0引用：2難度：0.6
相似題
-
1．I've started learning German recently.I found that I could understand and learn words （1）
，but it was hard for me to understand sentences.My teacher （2）me to read some children's books written in German.
（3），I felt a bit embarrassed（尷尬的） to read a book designed for children，but then I realized that everyone had to start from doing some simple things，so I started with German books which are suitable（適合的） for （4）in schools.Then I （5）Oliver Twist by Charles Dickens and Roald Dahl's James and the Giant Peach were so interesting.
I used a dictionary to help me at first，so that I could （6）words I didn't know.But my teacher stopped me.He told me to （7）the words from the context（上下文）.After a week，I was （8）to find it was really a good way to learn new words.He also said the （9）in these books could help me understand as well，because pictures were also a kind of language.
As a beginner，I often （10）the stories that are interesting.Now I'm getting better and better in German.（1） A.happily B.loudly C.easily D.luckily （2） A.imagined B.discovered C.advised D.allowed （3） A.At last B.On time C.In silence D.At first （4） A.students B.doctors C.pilots D.policemen （5） A.encouraged B.found C.sold D.invented （6） A.care about B.talk about C.think of D.look up （7） A.understand B.write C.spell D.pronounce （8） A.quick B.tired C.surprised D.scared （9） A.pictures B.covers C.themes D.prices （10） A.guess B.read C.trust D.steal 發(fā)布：2025/1/30 8:0:1組卷：2引用：1難度：0.5 -
2．
（1）Who wrote this book review？BOOK CLUB：YOUR REVIEWS： 
What's the book about？
The book is about a boy called Charlie.His family is very poor - they don't have much money and they don't have much food.
There is a chocolate factory near Charlie's house.It is Willy Wonka's factory.Willy Wonka invites five children to visit the chocolate factory.
My favourite character：My favourite character is Charlie because he is very kind.I don't like the other children because they are horrible! Title：Charlie and the Chocolate Factory Author：Roald Dahl 
My opinion of the book ：
This book is great!l love the incredible chocolates and sweets in the factory.Words to describe the book：
Interesting funny sad amazing magical excitingStar rating：
I give Charlie and the Chocolate Factory：
★★★★★
5 stars = Fantastic!
4 stars = Very good!
3 stars = OK
2 stars = Bad
1 star = Terrible!
Review by：Gabrielle （age 12）
A．Charlie.
B．Gabrielle.
C．Roald.
D．Willy.
（2）What is the review writer's rating of the book？
A．Fantastic!
B．Very good!
C．Bad!
D．Terrible!
（3）Which of the statements is NOT true about the book？
A．Willy Wonka was the owner of the chocolate factory.
B．The main character Charlie was born in a poor family
C．Charlie and four other kids visited the chocolate factory
D．The other four children went into the factory without invitation.發(fā)布：2025/1/30 8:0:1組卷：12引用：3難度：0.9 -
3．It can take you a day out to Singapore（新加坡） because of the plane.Singapore is one of the most beautiful（1）
in Asia.There are lots of visitors（2）to the country every year.But were you there years ago？Great changes have（3）in the country.For many Chinese tourists，this small island country in（4）Asia is a wonderful place to take a （5）.On one hand，more than three（6）of people are Chinese.（7）you can simply（8）Chinese with most of the local people.On the other hand，Singapore is an English-speaking country，so it is also a good place to（9）your English.
Did you ever try Chinese food outside China？Maybe you are afraid that won't be able to find anything to eat in a foreign country.In Singapore however，you'll find a lot of （10）from China；you won't have any problem（11）rice，noodles，or dumplings.However，if you're feeling brave，Singapore is an excellent place（12）new food.Whatever you like Indian food，Western food，or Japanese food，you'll find it all in Singapore.
One great thing about Singapore is that the temperature is almost the same all year（13）.You needn't wear （14）clothes（15）it is warm in all the seasons.（1） A．countries B．country C．cities D．city （2） A．visiting B．traveling C．living D．reaching （3） A．took place B．takes place C．take place D．taken place （4） A．Northeast B．Northwest C．Southeast D．Southwest （5） A．bus B．photo C．holiday D．look （6） A．members B．quarters C．halves D．thousands （7） A．So B．Because C．Although D．But （8） A．say B．speak C．talk D．tell （9） A．practice B．protect C．listen D．provide （10） A．drinks B．meat C．food D．fruit （11） A．find B．finding C．to find D．found （12） A．try B．to try C．trying D．tried （13） A．most B．fast C．long D．round （14） A．thick B．thin C．cool D．cold （15） A．because of B．because C．instead of D．instead 發(fā)布：2025/1/5 12:0:4組卷：6引用：1難度：0.5