Our brain is just like our body, the more we use it, ______ it gets.
A. the better B. the best C. the worse D. the worst
九年级英语单选题中等难度题
Our brain is just like our body, the more we use it, ______ it gets.
A. the better B. the best C. the worse D. the worst
九年级英语单选题中等难度题查看答案及解析
The Internet is convenient for us to get _____, but we have to use our brain to think if it is useful.
A. a hole B. information C. program D. paper
九年级英语单选题中等难度题查看答案及解析
Today the world's economy is not going well. Crisis（危机）is to our life just like to our body. Just as fatal(致命)disease can destroy our body and sometimes even put an to our lives, so does crisis knock us down so hopelessly that we might never have chance of standing up again．Just take my own country for instance．Of course，in the twenty years，our economy has gained the highest speed．But haven't we paid too much?Our rivers are ．Our natural resources are becoming and fewer．Is it worthy of it?
Crisis sometimes contributes(贡献)to our life treasure in a way that few can imagine．It can make us strong enough to face ourselves when we feel weak．Eric，my uncle is an . He had hard time in his going through such a fatal disease that he had never thought he survive. ，he was saved by doctors．Ever since then he regarded his life as a second given by God and has been so grateful to the world that he his best to do what he could. And now he is living a and successful life．
1.A. ill B.illness C.sick D.patient
2.A．end B.finish C.over D.ending
3.A．last B.next C.past D.during
4.A．pollution B.polluted C.polluting D.pollute
5.A．1ess B.few C.little D.fewer
6.A.example B.case C.such as D.for example
7.A.childhood B.child C.children D.child time
8.A.Luck B.Lucky C.Luckily D.Luckly
9.A.try B.do C.tried D.does
10.A．happy B.happiness C.pleased D.pleasure
九年级英语完型填空困难题查看答案及解析
The human brain is very small and light only two percent of our total body weight, but it needs about 20% of the oxygen(氧气) that our body takes in. We can't think well if our brain isn't getting enough oxygen, so always make sure there is enough oxygen in the air when you need to learn or remember something. No one can remember everything. but everyone can learn how to improve their memory. Here are some suggestions ---none of them can make your memory 100% perfect, but all of them are helpful.
When you want to remember something, tell a friend about it. This way the new information becomes more memorable. Later on, think about the conversation with your friend. It will remind you of the information you wanted to remember.
Don't over-train your brain. When you've remembered a list of new words, stop studying. It's better to study a lot of material for a small amount of time than a small amount of material for a lot of time! But remember you do have to practice your new words regularly!
Our memory works well when we are asleep. If you want to remember something, go to bed and go to sleep right now after learning it.
If you have to remember something big, divide it into small parts. It's easier to remember 198756430387 if you divide it into four smaller bits:198-756-430-387.
If you want to remember a piece of information, and you can't, don't get angry. Relax and tell yourself, "If it's important, I will remember it later.”
One of the best ways of remembering is to make pictures on the movie-screen of your mind and it's fun, too! Scientists say that our brain works a lot in pictures. So sometimes, if we want to remember new information, it helps to make a picture story. Anyone can learn to do this.
1.If you Weigh fifty kilograms, how heavy is your brain?
A.About ten kilograms.
B.About two kilograms.
C.About one kilogram.
2.How many helpful suggestions are mentioned in the passage?
A.Five. B.Six. C.Seven.
3.What should someone do after he has remembered a list of new words?
A.He should rest, then practice them regularly.
B.He should tell himself about what he has done.
C.He should continue to remember more new words.
4.Which of the following is TRUE according to the passage?
A.It's useless to remember something before going to sleep.
B.It's easier to remember something by dividing it into small parts.
C.It's harder to remember something by changing words into pictures.
5.What's the best title of this passage?
A.An introduction to our brain.
B.Some good ways of learning.
C.Advice on improving our memory.
九年级英语阅读单选简单题查看答案及解析
Our skin is like a bag that we live in. Inside the bag our bodies are mostly water. Our water is like the water in the sea. It is very salty. Also, like the ocean, we can lose our water. The wind and the sun could take it away. Our bag of skin keeps our body’s ocean from drying up.
Our skin keeps out sunshine. Too much sunshine can hurt us. Skin also keeps out dirt. That’s important because some kinds of dirt can make us sick. Our skin feels things. It feels warm things, cold things, things it touches, and things that hurt it. A campfire feels warm. A snowball thrown in our face feels cold and hurts us. A hug is the touch of another person’s skin on our own.
Our hair is a special kind of covering. It helps us keep things out of our eyes, ears and nose. Hair is also good for keeping us warm. When we get goose bumps (鸡皮疙瘩), our body hairs stand up. Then the hairs hold air close to our skin like a thick blanket (毯子). Hair keeps animals warm, too.
Some animals have more hair than others, so they have a better blanket for cold weather.
Our nails (指甲) are another special skin which are very hard. They help keep our fingers from
getting hurt. Our nails aren’t as strong as the nails that animals have. But they are good for picking up coins.
1.Our skin is like a bag full of salt.
2.Our skin keeps out dirt and sunshine.
3.Our skin helps us feel things, touch or hurt others.
4.Our hair helps protect our eyes, ears and nose.
5.Our nails are weaker than the nails that animals have but can keep our fingers safe.
九年级英语任务型阅读中等难度题查看答案及解析
We always use body language in our daily life. When we have a talk with someone, we may use more body language than words. However, the same body language may mean different things in different countries. That’s why people sometimes do not understand each other correctly. Pointing to one part of the body can mean differently in different cultures. For example, in the USA people point to their heads when they think someone is clever. However, in Europe it means “He or she is stupid or something is wrong with his or her head” .In China, nodding heads means “Yes” and shaking heads means “No”. However, in parts of Greece and Turkey, they mean just the opposite. In England or the USA, when you raise your hand and make a circle with the thumb(大拇指) and the second finger, it means “Everything is OK.” However, if you do this in France or Belgium, it means “You’re worth zero.” In Greece or Turkey, you should not make this gesture, or you are thought to be very rude.
The meaning of gestures can also change over time. In the 1960s, the V sign meant “peace”. However, during World War II, it meant “victory”. In Greece, it is a very insulting(侮辱性的) sign.
Though the meaning of body language is different, there are some expressions having the same meaning throughout the world.
1.In England, if people point to their heads, it means they think someone is _________.
A. clever B. stupid
C. beautiful D. angry
2.In parts of Turkey, if one nods his head, it means he ________ .
A. doesn’t agree B. agrees
C. is happy D. is sad
3.In France, if you raise your hand and make a circle with the thumb and the second finger, it means ________.
A. it is true B. everything is OK
C. you are clever D. you are worth nothing
4.The V sign meant _____ during World War II.
A. peace B. victory
C. agreement D. killing
5.In which country is the body language the most different from our usual thinking?
A. France. B. England.
C. Greece. D. America.
九年级英语阅读理解中等难度题查看答案及解析
—Is the zipper really a great invention?
—Yes. Just think about how often it’s used in our ________ lives.
A. patient B. friendly C. public D. daily
九年级英语单选题中等难度题查看答案及解析
—The transportation in our country is much more ______than it used to be.
—But traveling becomes much easier!
A. convenient B. expensive C. difficult D. trendy
九年级英语单项填空中等难度题查看答案及解析
—The transportation in our country is much more ______than it used to be.
—But traveling becomes much easier!
A. convenient B. expensive C. difficult D. trendy
九年级英语单选题中等难度题查看答案及解析
We take showers and use the toilet every day to get rid of badly waste. Our brains also need to take a bath every day. How can they do it?
A 2013 study found the answer. Researchers at the LS University of Rochester studied the brains of mice and discovered that they cleaned themselves while the mice slept. A kind of fluid in the brain, called cerebral spinal fluid (CSF, 脑脊液), was found to increase dramatically (显著地) during sleep, washing away waste proteins that had been building up between brain cells in waking hours.
"This study shows that the brain has different functional stales when asleep and when awake," Maiken Nedergaard, the lead researcher, told NBC News. It also explains why we can't seem to think clearly after a sleepless night while a good night's sleep leaves us feeling sharp and refreshed.
Now a new study, published on Oct 31 in Science, digs a little deeper into our brains' self-cleaning procedure. Instead of mice, this time humans were the test subjects.
Researchers at Boston University, US, monitored (监测) the brain waves of 13 healthy adults who were sleeping, using accelerated MRI, which is capable of recording faster changes inside the brain than a regular MRI machine. They found that every 20 seconds, blood flowed out of the brain, making room for a large amount of CSF to come in and "clean". This cycle coincided with(与……一致) the rhythm of the brain's slow waves-an electrical activity that happens when we're in deep sleep.
It's still unknown how these brain activities are connected. But the mere fact that they are connected is exciting enough, since it allows researchers to piece together (拼凑出) possible new explanations for misunderstood diseases.
For example, slow-wave sleep has been proven to play a role in strengthening our memories. This may explain why people with Alzheimer's often have fewer and weaker slow brainwaves. Based on this new study, there could be one more explanation for diseased brains: They are not clean.
Nedergaard, leader of the 2013 study, is also excited about the new findings. "Maybe the most important take-home message is that sleep is a serious thing," she told Scientific American. "You really need to sleep to keep a healthy brain because it links electrical activity to a practical 'housekeeping' function."
1.When the researchers studied the brains of mice, they found __________.
A.CSF in their brains went down when the mice slept
B.CSF carried away waste proteins in their brain during sleep
C.more waste proteins were produced in their brains when asleep
D.the more CSF was in their brains, the fewer waste proteins were
2.What did the researchers discover when they monitored human brain waves?
A.The rhythm of the brain was slower than that of CSF.
B.The brains worked more slowly when asleep.
C.Brains were cleaned when blood flowed out.
D.It took 20 seconds for CSF to clean brains.
3.Which of the following would be the best title for the passage?
A.Connecting Brain Activities B.Cleaning in Your Dreams
C.Having a Good Sleep D.Explaining Diseases
九年级英语阅读单选中等难度题查看答案及解析