Why would human beings waste a third of their lives sleeping when they could be doing more important things like looking after their families or working？Some scientists believe sleeping helps recharge the body.jye.ai others think it is important for strengthening newly formed memories.Now，there is new evidence which suggests that the purpose of sleep may be to forget some of the millions of new things we learn each day.
The neurons in the human brain consist of fibers called dendrites （樹突）.These grow as we learn new things and connect the brain's cells to each other at contact points called synapses （突觸）.The larger the dendrites become and the more cells they connect，the more information we store.
In 2018.Giulio Tononi and Chiara Cirelli，both biologists at the University of Wisconsin Madison，suggested a new idea：The things our brains learn each day result in so many synapses that things start to get a little messy.Sleeping allows us to sort through （整理） the "noise" and dispense all the unnecessary information.leaving behind only the most important memories.
Recently，the university's research has provided direct evidence to support the jye.aiory.The experiment involved analyzing 6.920 synapses in the brain shavings from two groups of mice over a four-year period：one group had been allowed to sleep，while the other had been kept awake and entertained with toys.The researchers discovered that the brain shavings of the sleeping mice had nearly 20 percent fewer synapses than those that had been kept awake and entertained.
It was also evident during the study that the brain does not shave every synapse.20% of neurons remained unchanged：these were most likely well established memories.Therefore.although we may be sleeping to forget some of what we've learned，the brain "forgets" in a smart way.
Most researchers believe clearing our brains is not the only purpose of sleep.
Resting our minds and bodies has also been found to help with other biological functions like strengthening our immunity.Though scientists may never agree on a single reason.jye.ai are all sure of one thing — a good night's rest is essential for our health.So try and spend at least a third of your day sleeping!
（1）What's the purpose of sleeping according to the new discovery？（no more than 15 words） To forget some of the millions of new things we learn each day.To forget some of the millions of new things we learn each day.
（2）What's the main idea of Paragraph 2？（no more than 10 words） How the neurons in the human brain help store informationHow the neurons in the human brain help store information
（3）What does the underlined word "dispense" in Paragraph 3 probably mean？（no more than 5 words） Get rid of. / Do away with. / Take out. / Remove.Get rid of. / Do away with. / Take out. / Remove.
（4）What agreement do all the scientists probably reach about sleeping according to the text？（no more than 10 words） A good night's rest is essential for our health.A good night's rest is essential for our health.
（5）Do you think a good night's sleep will benefit your next-day study？Please explain in your own words. （no more than 20 words） Yes.Because it helps us discard all the unnecessary information and leave only the most important memories.Yes.Because it helps us discard all the unnecessary information and leave only the most important memories.
【答案】To forget some of the millions of new things we learn each day.；How the neurons in the human brain help store information；Get rid of. / Do away with. / Take out. / Remove.；A good night's rest is essential for our health.；Yes.Because it helps us discard all the unnecessary information and leave only the most important memories.
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發(fā)布：2024/4/20 14:35:0組卷：9引用：2難度：0.4
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1．What is your favourite food？Some people love pizza.Some people love ice cream.Not many would say broccoli is their favourite food.You can't eat only pizza and ice cream all the time.You also need fruits，vegetables，and other kinds of foods. （1）
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You need all kinds of foods to keep your body strong and healthy.Nutritionists say you should eat grains，such as bread，pasta，and cereal.You should eat eggs，milk，cheese，and other dairy products.You should eat meat，fish，beans，or tofu （bean curd）.（2）.They also say you need to eat plenty of fruits and vegetables every day.
You need food for many reasons.Your stomach feels hungry when you need to eat more food.You need food in order to live and satisfy your hunger.
（3）.Every part of your body uses energy from food.Your brain uses energy to think，your heart uses energy to beat，and your muscles use energy to move.Growing requires food.Your body also needs energy from food to stay warm.
Eating the right kinds of foods can help keep you healthy.Eating certain foods can help prevent some diseases.
The human body contains a lot of jye.ai.Water makes up most of your blood and helps carry oxygen and food to the cells in your body.（4）.Water does many other things inside your body.You need eight to ten cups of water each day to replace the water that your body uses up.But don't worry-drinks such as milk or juice contain mostly water. （5）.
A.Your body needs food to make energy
B.You could live for weeks without food
C.Water helps your body get rid of wastes through urine and sweat
D.Water is also very important for your body
E.Many foods，especially juicy fruits，contain water as well
F.But you should not eat too many foods with lots of fats or sugars
G.Carbohydrates，proteins，fats，vitamins，minerals，and water are nutrients發(fā)布：2024/12/13 0:0:1組卷：5引用：3難度：0.7 -
2．Ways to Improve Your Health Sometimes it may seem difficult to improve our health.If so，the following health habits may help you.
●（1）
Research shows that eating a meal in the morning results in less body fat and less chance of overjye.ai.Eating breakfast can help people feel better physically and mentally through the day.
●Get enough sleep.
Poor sleep can influence our memory and learning. （2）Studies show that people who don't get enough sleep seem to get into more accidents.So stay safe and get enough sleep!
●Take a walk every day.
（3）Instead of meeting friends for a meal，meet them for a walk.As you walk，you will see the beautiful world around you.Once you try，you will find that adding a walk into your daily life is very easy.
●Make social connections.
Social groups can provide support.They might include sport teams，art or music groups.The people in the group can offer advice and can help each other in difficult times.Also，being in a group keeps your mind busy.（4）
●Have a hobby.
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A．Get much exercise.
B．Eat breakfast every morning.
C．It can also cause traffic accidents!
D．An active mind is a healthy mind!
E.Spending time with others is very helpful.
F.Everyone could get a little more joy in their lives!
G.Walking is an easy way to add exercise to our lives.發(fā)布：2024/12/7 10:0:2組卷：5引用：6難度：0.5 -
3．Being fit is a way of saying a person eats well，gets a lot of physical exercise，and has a healthy weight．There are a lot of discussions these days about fit kids．（31）
1．Eat a variety of foods．
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2．Listen to your body．
What does it feel like to be full？When you're eating，notice how your body feels and when your stomach feels comfortably full．Sometimes，people eat too much because they don't notice when they need to stop eating．（33）And over a period of time，overeating can lead to unhealthy weight gain．
3．（34）
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These rules aren't magic．However，follow them most of the time and you can become a fit kid sooner or later．
A．Limit screen time．
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C．Drink water and milk．
D．Ask your parents to help you do your favorite activities regularly．
E．Eating too much can make you feel uncomfortable．
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G．Try to spend no more than 2 hours a day on screen time．發(fā)布：2024/12/8 5:0:1組卷：40引用：3難度：0.7
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