Have you ever experienced the feeling of fall...

Have you ever experienced the feeling of falling as you start to fall asleep? Sometimes you may come to realize this feeling. If so, don’t worry. Many people have felt the same thing.

In fact, these muscle twitches (肌肉抽搐) in the arms, legs or other parts of the body are called hypnic jerks (入睡抽动) or sleep starts. And they are very common. Up to 70 percent of people experience them sometimes, Huffington Post reported. But what causes it?

There are some theories(理论). Some scientists believe that the feeling of falling comes from the body relaxing itself, especially if the person is anxious or unable to get comfortable. As you’re about to sleep, your muscles become relaxed. But your brain stays awake. It misunderstands the relaxing of your muscles as a sign that you’re falling.

Then the brain jerks the body awake as if it’s trying to protect you.

Other scientists believe that different phases of sleep might cause the hypnic jerks. When we sleep, we experience two phases: non-rapid eye movement (NREM) and rapid eye movement (REM). During REM, our heart rate (心率), breathing and nervous system can act irregularly (不规律地). If the body experiences flashes (一瞬间) of REM while entering sleep, these irregularities could cause twitches.

If you don’t want to experience hypnic jerks, scientists have some suggestions. When you become deeply relaxed, you can learn how to reconnect slowly by moving your fingers and toes a little bit. Then start to move your head and open your eyes, while being aware of yourself as you get out of the relaxed state.

But experts agree that hypnic jerks, though sometimes scary, are harmless. If it wakes you up, simply roll over and go back to sleep. But keep in mind: a caffeinated (含咖啡因的) drink, exciting evening activities or stress may make hypnic jerks happen more often.

1.The third paragraph mainly tells us_____________.

A. there are all kinds of theories about hypnic jerks

B. different phases of sleep might cause hypnic jerks

C. People sometimes get anxious or uncomfortable

D. the feeling of falling comes from the body relaxing itself

2.How many theories on what causes hypnic jerks are mentioned?

A. Two　　 B. Four　　 C. Three　　 D. Five

3.Which of the following can make hypnic jerks happen more often?

(1)Drinking caffeinated drink　　　　　　　　 (2)Singing songs for a long time before sleep

(3)Too much stress　　　　　　　　　　　　　 (4) reading a book quietly

A. (1)(2)(3)　　 B. (1)(2)(4)　　 C. (2)(3)(4)　　 D. (1)(3) (4)

4.What is the best title?

A. How to Experience Hypnic Jerks　　 B. What causes Hypnic Jerks

C. Feelings of Falling While Going to Sleep　　 D. Sleeping Is Good for Our Health

九年级英语阅读理解中等难度题查看答案及解析

Have you ever ridden a Ferris wheel lately? Can you imagine the flying feeling as you are pulled up to the top and then moved down to the bottom quickly again?

Today a Ferris wheel is usually 40 to 60 feet tall． That seems very high when you are on the top looking down． But the first Ferris wheel was 264 feet high – taller than a twenty-story building! Can you imagine the view from the top of that?

The first Ferris wheel was built for the 1893 World’s Fair in Chicago． The people who planned the fair were looking for an attraction that would bring people to Chicago． George Ferris handed a drawing of a giant wheel that people could ride on． At first everyone laughed at his strange idea． But Mr． Ferris did not give up,　 and finally the idea was accepted． The ride opened in June of 1893．

Today’s Ferris wheels have 12 to 16 seats,　 which each carry 2 or 3 people． But that first one had 36 enclosed cars,　 each holding 60 passengers． When filled,　 it carried 2, 160 people． During that summer in Chicago,　 about 1．5 million people rode the Ferris wheel．

After the fair the ride was moved to a nearby amusement park built especially to show off the wheel． In 1904,　 it was moved again – to St． Louis for the Louisiana Purchase Exposition． After the fair there,　 the wheel stood unused． In 1906 it was finally sold to a company for scrap metal (废铁)．

Luckily a Chicago bridge builder,　 W．E． Sullivan,　 figured out how to make a smaller Ferris wheel that could easily be taken apart and put together． In 1906 he started the company that still makes many of the Ferris wheels used today．

But,　 whenever you ride one,　 remember that it all began with George Ferris’s strange idea!

1.How tall is a Ferris wheel today?

_________________________________________________________________

2.What was the first Ferris wheel built for?

_________________________________________________________________

3.What did people think of Ferris’s idea at first?

_________________________________________________________________

4.How many people rode the first Ferris wheel during the summer in 1893?

_________________________________________________________________

5.Compared with today’s Ferris wheels,　 what was the first Ferris wheel like?

_________________________________________________________________

九年级英语阅读理解中等难度题查看答案及解析

—Jolin, how long have you been a teacher as a pop star?

—________ the end of last month, after Jolin’s English Diary Book came out.

A. Since B. In C. By D. At

九年级英语单选题中等难度题查看答案及解析

—Jolin， how long have you been a teacher as a pop star?

—______the end of last month， after Jolin’s English Diary Book came out.

A. Since　　　　　　 B. In　　　　　　　　　 C. By　　　　　　　 D. At

九年级英语单项填空中等难度题查看答案及解析

Actually, long-distance bicycle camping is one of the happiest activities I have ever experienced. I generally sleep poorly at night, but in the woods on a tour, I sleep like a baby with the music of insects. In the morning, birds wake me up. I eat a snack before getting up, and then I quickly pack my sleeping bag, tent, and other things and get on the road. Usually I have less speed. Traveling by bike allows me to stop anywhere, such as lakes（especially places to swim）, woods, and scenic spots（景点）.

Somewhere near lunch, I find a small drugstore and buy some bread, sandwich materials, and fruit. In the afternoon, my speeds are higher, and I spend less time at stops. In the late afternoon, I start thinking about stopping. I finally find a place in the early evening, cook a simple meal, and rest and cool off. As it starts to get dark, I put up my tent, and fall asleep.

There are exciting times and difficult times as well. Visiting strange or famous places are always exciting to me. I meet and talk with interesting people along the way. Enjoying beautiful scenes, meeting wild animals（usually at my camping site）, and traveling up and down hills also make me cheerful. On the other hand, I may run into rainy or hot days, have to repair my bike, or just find myself in a bad state. The problems are easily dealt with. The pleasures remain in my mind for years.

1. Where does the writer usually have a good sleep?

A. In a hotel.　　　　 B. At home.

C. In the woods.　　　 D. In a drugstore.

2.From the passage, we know the writer has the following abilities EXCEPT ___.

A. Cooking outside　　　　　　 B. Talking with animals

C. Putting up tents　　　　　　 D. Fixing up bikes

3.Which of the following is TRUE according to the passage?

A. The writer has to sleep late during the tour.

B. The writer doesn’t want to get up early.

C. The writer always has fruit for breakfast.

D. The writer rides faster in the afternoon.

4.It can be inferred from the passage that the writer _______.

A. enjoys a free and pleasant bike ride

B. rides a bike to work every day

C. is afraid to meet animals on the road

D. is unhappy to ride a bike alone

九年级英语阅读理解困难题查看答案及解析

Do you like to go camping? Have you ever got lost in the wild? Even experienced campers ________ get lost. To avoid getting lost, stay on marked roads. Take a notepad and a pencil with you for writing notes. Use a compass so that you can know what ________ you are going to.

If you do get lost, don’t scare. Getting into a scare is the ________ thing you can do. People who scare have been known to walk in big circles. They don’t ________ this, of course. They make themselves so ________ that they can’t get back to the right road.

If it is late, and others know you are out alone, stay ________ you are. Someone will come to ________ you soon. If it is early, and you want to try to find your way back, leave marks to show where you have been. Put some stones on the ________ you have taken. If you have a pen and a notepad in your pack, write a note and put it on a tree. Write down the time, the date, the fact that you are lost and the direction you are now taking.

If you are lost at night, build two camp fires close together. Two columns of smoke side by side are a signal for ________. If other campers see the smoke signal, they will come to find you.

At the same time, put on all the clothes from your bag to keep ________. Be patient and wait until help arrives.

1.A.never B.seldom C.often D.sometimes

2.A.direction B.place C.time D.space

3.A.best B.easiest C.worst D.closest

4.A.change B.realise C.think D.remember

5.A.busy B.excited C.relaxed D.tired

6.A.what B.where C.when D.how

7.A.wait for B.look for C.ask for D.pay for

8.A.road B.river C.bridge D.wall

9.A.fun B.question C.surprise D.help

10.A.brave B.strong C.warm D.cold

九年级英语完型填空中等难度题查看答案及解析

As a ninth-grade student, you may be under much pressure of schoolwork. Do you ever feel like you are just rushing from one subject to　　 1.at school? When things happen so fast, it is easy to get lost of what you are doing or learning.2.it is important to stop yourself every now and then to think about what you’ve been doing or learning.

Self-reflection（反省）means slowing down and calming yourself, including calming your　 mind. By being calm and going slowly, you give your brain a chance to think about what it has already 3.. Some people prefer to do these self-reflections only in their mind. Others keep a diary or written notes. Either method works, depending on your own personal learning.

Choose the proper time to do it. School textbooks are4.into units of study. This makes it5.for someone to begin self-reflection. Look for time when you complete a unit of study in the subjects you are learning, such as math, science and art. Sometimes you know the unit is over because there is some kind of test. Use these natural breaks to stop and do self-reflection.

Find a quiet place. You can even be sitting at your desk at school when you finish something early and the other students are6.working. If you are going to take notes, take out paper or your reflection diary. Write down some notes on the new things that you learned in the unit. Let your mind think about the notes you have written and make some connections.

Think about things that you are not sure　　 7.. Maybe you learned a new way to work out a math problem, but you’re not sure when to use it. Writing down your questions will help you remember to look for answers the next8.you are working with the same topic.

Self-reflection is important for a successful student. If you have never taken the time to do self-reflection, try it now.

九年级英语单词填空中等难度题查看答案及解析

用所给词组的适当形式填空。（5分）

1. Have you ever __________ __________ Donald Duck?

2. She’s doing her homework. Would you mind _________ your voice_________?

3. We often see the boy __________ __________ the litter in the school yard.

4.He _________ __________ __________ drive a car when he was 18.

5.Last summer Lisa went to Guilin. She __________ __________ __________ with it.

九年级英语选词填空中等难度题查看答案及解析

Have you ever wondered how we know the things that we know? How do we know that the stars are really huge balls of fire like the Sun and very far away? And how do we know that the Earth is a smaller ball turning round one of those stars, the Sun?

The key to those questions is“ evidence"(证据). Sometimes evidence means actually seeing (or hearing, feeling, smelling…) that something is true. Astronauts have travelled far enough from the Earth to see with their own eyes that it is round. Sometimes our eyes need help The" evening star" looks like a bright twinkle in the sky, but with a telescope( 望远镜 ) you can see that it is a beautiful ball. Something that you learn by direct seeing(or hearing or feeling… )is called an observation(观察)

Often evidence isn't just observation on its own, but observation always hides at the back of it. If there's been a murder, often nobody(except the murderer and the dead person!)actually observed it. But detectives(侦探)can gather together lots of other observations which may all point towards the suspect(嫌疑犯). If a person’s finger- prints match those found on a knife, this is evidence that he touched it. It doesn't prove(证明)that he did the murder, but it can help when it's joined up with lots of other evidence.

Prediction helps to look for evidence. Scientists make a guess about what might be true. For example, if the world is really round, we can predict that any of us, going on and on in the same direction, should eventually find ourselves back where we started

People sometimes say that you must believe in feelings deep inside, but not all the inside feelings are real evidence.

What can we do about all this? When somebody tells you something that sounds possible, think to yourself: "Is there any evidence for that? And, next time somebody tells you that something is true, why not say to them: What kind of evidence is there for that? "Remember ,always think carefully before you believe a word.

1.Why does the writer use the example of a detective in Paragraph 3?

A. To explain what prediction is

B. To tell what observation is called

C. To introduce how detectives work.

D. To prove evidence is not just observation

2.The underlined "eventually "in Paragraph 4 means　　　　　　

A. probably　　 B. finally　　 C. completely　　 D. luckily

3.Which of the following is TRUE according to the passage?

A. Prediction helps to prove something if it is true.

B. What you see directly is real evidence

C. People should always believe their inside feelings

D. Astronauts find the Earth is round with a telescope.

4.what's the best title of the passage?

A. Evidence speaks

B. Scientists make predictions

C. Inside feelings help get ideas

D. Observation offers the facts

九年级英语阅读单选困难题查看答案及解析

Have you ever had the strange feeling that you were being watched? You turned around and, sure enough, someone was looking right at you!

Parapsychologists (灵学家) say that humans have a natural ability to sense when someone is looking at them. To research whether such a“sixth sense”really exists, Robert Baker, a psychologist (心理学家) at the University of Kentucky, did two experiments.

In the first one, Baker sat behind unknowing people in public places and stared(盯着）at the backs of their heads for 5 to 15 minutes. The subjects（受试者）were eating, drinking, reading, studying, watching TV, or working at a computer. Baker made sure that the people could not tell that he was sitting behind them during those periods. Later, when he questioned the subjects, almost all of them said they had no sense that someone was staring at them.

For the second experiment, Baker told the subjects that they would be stared at from time to time from behind in a laboratory setting. The people had to write down when they felt they were being stared at and when they weren’t. Baker found that the subjects were no better at telling when they were stared at and when they weren’t.

Baker concludes that people do not have the ability to sense when they’re being stared at. If people doubt the outcome of his two experiments, said Baker,“I suggest they repeat the experiments and see for themselves.”

1.The aim of the two experiments is to ________.

A．explain when people can have a sixth sense

B．study how people act while being watched in the lab

C．study whether humans can sense when they are stared at

D．prove why humans have a sixth sense

2.The underlined word “outcome” in the last paragraph most probably means ________.

A．value             B．result             C．performance       D．connection

3.In the second experiment, the subjects _________.

A．could tell when they were stared at

B．could tell where they weren’t stared at

C．couldn’t tell who they were stared at or who they stared at

D．couldn’t tell when they were stared at or when they weren’t

4.What can be learned from the passage?

A．People are born with a sixth sense.

B．The experiments support parapsychologists’ idea.

C．The subjects do not have a sixth sense in the experiments.

D．People have a sixth sense in all places.

九年级英语阅读理解中等难度题查看答案及解析