Do you still remember the lecture from China's Tiangong space station last year？On March 23，（1）astronautsastronautscalled Zhai Zhigang，Wang Yaping and Ye Guangfu gave another one!It was livestreamed worldwide.What fun experiments did they do this time？
Hot "ice"
Last time，the astronauts made a water ball in space.This time，they（2）turnedturneda water ball into an "ice" ball!Well，it's not actually ice.It's supersaturated sodium acetate solution（過飽和乙酸鈉溶液）.
The supersaturated solution is very unstable（不穩定的）.The astronauts dropped a small crystal（晶體）of sodium acetate into the ball-shaped solution.Suddenly，more sodium acetate crystals grew，making a white ball of "ice".However，this "ice" is anything but cold.The process actually gives off heat!
A bridge of water
How do you build a "bridge" with water？It's hard to do it on the earth.But in the space station，with little gravity（重力），it's quite easy!
In the lecture，（3）firstfirstWang Yaping made two water balls on two plates，then let them touch each other.Next，Wang pulled the two plates apart，and the water between them（4）didn'tdidn'tbreak.It became a "bridge"!This is（5）becausebecausethe surface tension of water is not disturbed（干擾）by gravity in space.The surface tension（表面張力）keeps the "skin" of the water strong（6）sosothat the bridge doesn't break.
Separate water and oil
If we mix oil and water in a bottle on the earth，they will quickly separate（分離）because they have different densities（密度）.Gravity brings the water down while the oil stays on top.However，if you do this in the space station，（7）withoutwithoutgravity，the oil and water will blend together.
How can we separate them，then？In the lecture，Ye Guangfu rotated （旋轉） the bottle to create centrifugal force（離心力）.With this man-made gravity，the（8）heavierheavierwater is pushed to the furthest point，which brings the lighter oil closer to the center.
【考點】人與社會．
【答案】astronauts；turned；first；didn't；because；so；without；heavier
【解答】
【點評】
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發布：2024/6/27 10:35:59組卷：4引用：1難度：0.5
相似題
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1．
Dear Laura，A.For example，you shouldn't put your bread on your plate.
B.I hope to hear from you soon.
C.I'm very comfortable speaking French now.
D.I don't find French customs so strange anymore.
E.Another thing is that it is very impolite to say you're full
F.They go out of their way to make me feel at home.
Thanks for your message .Yes ，I'm having a great time on my student exchange program in France .I was a bit nervous before I arrived here，but there was no reason to be my host family is really nice .（1）.The grandmother has a teenage granddaughter about my age who is really kind.She always talks to me in French to help me practice.And you wouldn't believe how quickly my French has improved!（2）Though I still make lots of mistakes，it doesn't worry me as it used to.
My biggest challenge is learning how to behave at the dinner table.As you can imagine，things are different from the way they are at home.（3）.You're supposed to put it on the table!I thought that was pretty strange at first，but not I'm used to it.You shouldn't eat anything with your hands except bread，not even fruit.You have to cut it up and eat it with a fork.（4）.If you don't want any more food，you should just say，"That was delicious." Also you're not supposed to put your elbows on the table.I have to say that I find it difficult to remember everything，but I'm gradually getting used to it.（5）.
Dear Laura，I'll write again soon and tell you more about my life in France Hope you're having a good school year.
Yours，
Lin Yue發布：2025/1/30 8:0:1組卷：37引用：2難度：0.4 -
2．將下列單詞或短語填入空格中，每格限填一詞
A．anything B．something C．smell D．already E．other F．other G．went up
One day when Avantis was travelling on his donkey along the street，he saw two men quarrelling with each other．One was a young man，and the （1）was the owner of an eating house．The owner said， "You must pay for the smell of my food．""I haven't taken （2）from your eating house，" said the young man． "Why must I pay you the money？" "You have just walked by my eating house and taken the （3）of the nice food from my eating house，and you must pay for it，" the owner shouted at him．After Avantis knew what they were quarrelling about，he got off his donkey， （4）to the owner and said， "Well，I'll pay you the money．"He took out a bag of money coins．He shook it and said to the owner "There are a lot of coins in it．Have you heard them？" "Yes，I have，" said the owner． "Please pay me the money quickly，then．" "You have been paid （5）!"said Avantis， "You have taken the sound of my coins．The sound is what I have paid for the smell of your food．"發布：2025/4/7 9:0:1組卷：4引用：1難度：0.6 -
3．根據短文內容回答下列問題
Most people make their living with their hands． But Tom makes his living with his feet． It's a very good thing， too．Tom's story happens in a very small city in England． His parents are very poor． Seven people live in their small house． Tom has no place to play but in the street．Tom's father often plays football． Little Tom wants to play football， too． So his father makes a soft ball for him to kick． It's a sock filled with pieces of old cloth． The little boy kicks it every day．At last Tom learns to kick a real football and he can play football very well．
（1）Most people don't make their living with their feet， do they？．
（2）Where does the story happen？．
（3）Where does Tom live？．
（4）What does Tom kick at first？．
（5）Why doesn't Tom kick a real football at first？．發布：2025/4/7 10:0:1組卷：6引用：1難度：0.4
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