You might have noticed that sometimes, when you’re playing mobile games or making a video call, the picture suddenly freezes(卡顿)because the network speed is too slow. When you try to download a movie on your phone, it seems to take forever.
These annoying things will soon become things of the past, as China just issued commercial licenses(发放商业牌照)for 5G networks on June 6. This means that China’s telecommunications(电信) companies will be able to offer 5G network speeds for mobile phone users.
The “G” stands for generation (代) . 1G let us talk to each other, 2G let us send messages, 3G gave us mobile data and Internet, and 4G made all of these things faster. So what will 5G bring?
First of all, 5G is so fast that it will allow us to download an entire HD movie in a second. The delay(延时) between sending and receiving data will be shortened. Now, 4G takes about 100 to 200 milliseconds(毫秒),while humans have a reaction time of about 200 to 300 milliseconds. But 5G will get the delay down to 1 millisecond or less, which is almost real-time.
Because of this increase in speed, it will be possible to create and use new kinds of technology. Robots will be used to do operations because doctors will be able to control them from somewhere else without any delay. Self-driving cars will be able to drive more safely because they can smoothly communicate with other cars, traffic lights and road Sensors (传感器). 5G also makes the Internet of Things(IOT物联网)possible.
All in all, 5G will shape every type of technology that it touches. And you won’t have to wait too long for that to happen.
1.From the first paragraph we can know that________.
A.people can’t download movie at all on the phone
B.making a video call is impossible for phone users
C.sometimes the network speed is too slow to use
D.mobile games can’t be downloaded on the phone
2.What happened on June according to the passage?
A.China just gave commercial licenses officially for 5G networks.
B.Every mobile phone user could improve the network speed
C.Most mobile phone users didn’t use 4G anymore.
D.All the mobile phones are much cheaper than before.
3.Which of the following is NOT true according to the passage?
A.5G will make people’s life much easier and more convenient.
B.Self-driving cars will become safer because of the use of 5G.
C.Using 5G to download something doesn’t take any time at all.
D.5G can make people download an entire HD movie in a second.
4.We can find the passage________.
A.from an ad B.in a newspaper C.in a storybook D.in science fiction
九年级英语阅读单选困难题
You might have noticed that sometimes, when you are playing mobile games, the picture suddenly freezes(卡顿)because the network speed is o slow. However, these annoying things will soon become a thing of the past, as China just issued commercial licenses (发放商用牌照)for 5G networks on June 6, 2019. This means that China's telecommunications companies will be able to offer 5G network speeds to users.
The "G" in "5G"stands for generation. IG let us talk to each other, 2G let us send messages, 3G gave us mobile data and internet, and 4G made all of these things faster. So what will SG bring?
It will allow us to download an entire HD movie in seconds. The delay(延时)between sending and receiving data will be shortened. Now, 4Gtakes about 100 to 200 milliseconds, while humans have a reaction time of about 200 to 300 milliseconds. But 5G will get the delay down to I millisecond or less, which is almost real—time.
With the development of 5G, new kinds of technology will be created and used.
Robots will be used to do operations because doctors will be able to control them from somewhere else without any delay. Self—driving cars will be able to drive more safely because they can smoothly communicate with each other, traffic lights and road sensors.
5G networks will be powerful, but not perfect. They do have some disadvantages.
On one hand, 5G signals don't go very far. On 4G networks, you can be 10 kilometers away from the nearest transmission base(传送基站)and don't lose signal. But 5G maxes out at about 300 meters. On the other hand, 5G signals have a hard time going through walls and rains. This means we will need to build many small transmitters to make sure 5G signals can be received everywhere. Soon you may see small boxes on every street lamp and building.
1.Why does the picture freeze when we are playing mobile games?
2.What does "G" in"5G"stand for?
3.How long will it take to download an entire HD movie with 5G?
4.What is the fourth paragraph mainly about?
5.What disadvantages do 5G networks have?
九年级英语回答问题中等难度题查看答案及解析
You might have noticed that sometimes, when you’re playing mobile games or making a video call, the picture suddenly freezes(卡顿)because the network speed is too slow. When you try to download a movie on your phone, it seems to take forever.
These annoying things will soon become things of the past, as China just issued commercial licenses(发放商业牌照)for 5G networks on June 6. This means that China’s telecommunications(电信) companies will be able to offer 5G network speeds for mobile phone users.
The “G” stands for generation (代) . 1G let us talk to each other, 2G let us send messages, 3G gave us mobile data and Internet, and 4G made all of these things faster. So what will 5G bring?
First of all, 5G is so fast that it will allow us to download an entire HD movie in a second. The delay(延时) between sending and receiving data will be shortened. Now, 4G takes about 100 to 200 milliseconds(毫秒),while humans have a reaction time of about 200 to 300 milliseconds. But 5G will get the delay down to 1 millisecond or less, which is almost real-time.
Because of this increase in speed, it will be possible to create and use new kinds of technology. Robots will be used to do operations because doctors will be able to control them from somewhere else without any delay. Self-driving cars will be able to drive more safely because they can smoothly communicate with other cars, traffic lights and road Sensors (传感器). 5G also makes the Internet of Things(IOT物联网)possible.
All in all, 5G will shape every type of technology that it touches. And you won’t have to wait too long for that to happen.
1.From the first paragraph we can know that________.
A.people can’t download movie at all on the phone
B.making a video call is impossible for phone users
C.sometimes the network speed is too slow to use
D.mobile games can’t be downloaded on the phone
2.What happened on June according to the passage?
A.China just gave commercial licenses officially for 5G networks.
B.Every mobile phone user could improve the network speed
C.Most mobile phone users didn’t use 4G anymore.
D.All the mobile phones are much cheaper than before.
3.Which of the following is NOT true according to the passage?
A.5G will make people’s life much easier and more convenient.
B.Self-driving cars will become safer because of the use of 5G.
C.Using 5G to download something doesn’t take any time at all.
D.5G can make people download an entire HD movie in a second.
4.We can find the passage________.
A.from an ad B.in a newspaper C.in a storybook D.in science fiction
九年级英语阅读单选困难题查看答案及解析
B. Choose the best words and complete the passage (选择最恰当的单词完成短文)
You might have noticed that sometimes, when you’re playing mobile games or taking a video call, the picture suddenly freezes because the network speed is too ________. When you try to download a movie on your phone, it seems to take forever.
These annoying things will soon become a thing of the ________, as China just issued commercial licenses (发放商用牌照) for 5G networks on June 6, 2019. This means that China’s telecommunications (电信) companies will be able to offer 5G network speeds for mobile phone users.
The “G” in “5G” ________ generation (of mobile network technology). 1G let us talk to each other. 2G let us send messages. 3G gave us mobile data and internet, and 4G made all of these things faster. So what will 5G bring?
First of all, 5G is so fast that it will allow you to download an entire HD movie in seconds. The delay between sending and receiving data will be shortened. Now 4G takes about 100 to 200 milliseconds (毫秒), while humans have a reaction time of about 200 to 300 milliseconds. But 5G will get the delay down to 1 millisecond or less, which is almost real-time.
Because of this ________ in speed, it will be possible to create and use new kinds of technology. Robots will be used to do operations because doctors will be able to control them from somewhere else without any delay. Self-driving cars will be able to run more ________ because they can smoothly communicate with each other, traffic lights and road sensors (传感器).
5G also makes the internet of things (IoT, 物联网) possible. IoT is a large network that connects nearly everything. ________, your toaster might be able to automatically start making your breakfast after your alarm clock rings.
All in all, 5G will shape every type of technology that it touches. And you won’t have to wait too long for that to happen.
1.A.small B.low C.fast D.high
2.A.present B.future C.past D.old
3.A.goes to B.looks like C.relies on D.stands for
4.A.increase B.competition C.delay D.practice
5.A.widely B.slowly C.carefully D.safely
6.A.At last B.In addition C.For example D.In other words
九年级英语完型填空困难题查看答案及解析
阅读短文,根据短文内容回答问题.
When it comes to the letter grade on your test or homework, you might notice that there is no letter E. Have you ever thought about why that is so?
In the A, B, C, D and F grading system, the first four letters are typically considered passing grades. An F in this system simply stands for“fail”.The word“fail”happens to start with the letter F, which seems to leave out the letter E. The fact”.Some schools have U grade for“unsatisfactory”,or I grade for “incomplete”.
Even with all this said, we should also point out that E grade actually has been
used pretty commonly throughout the history of letter grades in the US.
The first college in the US to use a letter grading system like the ones we use today is Mount Holyoke College. In 1897,they began to use the following grading scale:
A: 95-100%(excellent) B: 85-94%(good) C: 76-84%(fair)
D: 75%(barely passed) E: below 75%(failed)
We can see the inclusion of E instead of F.
Gradually,the letter grading system became more popular throughout the US. However, many schools decided to drop the E grade and go straight to F.There is no evidence(证据) to really support this,but one possible explanation is that teachers were worried that some students and parents might mistake E for “excellent”.
Why do we have letter grades? Well,part of the reason is that they made grading simpler during a time of great change for schools. As the 20th century began,growing cities and an increase in immigration led to larger school classrooms. Most teachers at that time thought this new letter grading system was an easy,fair and clear way to grade students.
Today,more and more people argue that letter grades don’t fully reflect(反映) student learning。However,as teachers try to improve grading methods,many parents continue to favor the letter grades they got as kids, they are familiar(熟悉) and easy for parents to understand. So while they might not be perfect, the letter grades probably aren’t going away any time soon.
1.what does an F stand for in the A、B、C、D and F grading system?
2.when was the letter grading system first used in the US college?
3.what is one possible explanation for dropping the E grade?
4.what did most teachers think of the letter grading system in the 20th century?
5.why do many parents still prefer the letter grades today?
九年级英语回答问题困难题查看答案及解析
阅读表达
When it comes to the letter grade on your test or homework, you might notice that there is no letter E. Have you ever thought about why that is so?
In the A, B, C, D and F grading system, the first four letters are typically considered passing grades. An F in this system simply stands for "fail". The word "fail" happens to start with the letter F, which seems to leave out the letter E.
The first college in the US to use a letter grading system like the ones we use today is Mount Holyoke College. In 1897, they began to use the following grading scale;
A: 95-100% (excellent) B: 85-94% (good) C: 76-84% (fair)
D: 75%( nearly passed) E: below 75% (failed)
We can see the inclusion of E instead of F.
Gradually, the letter grading system became more popular all over the US. However, many schools decided to drop the E grade and go straight to F. There is no evidence(证据) to really support this, but one possible explanation is that teachers were worried that some students and parents might mistake E for "excellent".
Why do we have letter grades? Well, part of the reason is that they made grading simpler during a time of great change for schools. As the 20th century began, growing cities and an increase in immigration led to larger school classrooms. Most teachers at that time thought this new letter grading system was an easy, fair and clear way to grade students.
Today, more and more people think that letter grades don't fully show students' learning. However, as teachers try to improve grading methods, many parents continue to prefer the letter grades they got as kids, as they are familiar and easy for parents to understand. So while they might not be perfect, the letter grades probably aren't going away any time soon.
1.When was the letter grading system first used in the US college
______________________________________________________________________________
2.What is one possible reason for dropping the E grade
______________________________________________________________________________
3.If you're a teacher, do you prefer the letter grades? Why or why not?
______________________________________________________________________________
九年级英语回答问题困难题查看答案及解析
Have you ever noticed how you feel when you play with a dog or a cat? Or maybe even some other a1., like a goldfish or a rabbit. Of course, playing with pets is fun and spending time with them can also be good f2. our mental health.
"A pet can remind you that you are not a3.," said life coach Desiree. She added that pets give us unconditional(无条件的) 14.. This can be helpful when you feel lonely.
I can speak from my experiences about this. Sometimes I felt a bit unhappy or lonely since I lived by myself, b5. I never had the idea to own an animal pet. Recently I have the chance to take care of m6. friend's cats while she is away. Caring for her cats has made a big difference in my life.
When I come home, they're v7. happy to see me. When I'm tired or sad, they will c8. to me and "ask" me to pet(爱抚) them. It's almost like they can tell when I need someone to chat with. So the next time when you're f9. a bit blue, maybe you should find a dog or a cat to talk to. Even something as easy as petting a cat can make you feel h10. and healthier. Why not keep a pet to make your life different?
九年级英语单词填空中等难度题查看答案及解析
Why do people play sports? You might say “ to get exercise” and you’d be right. To have fun? That’s true , too. According to report, people who play sports get a lot more than just fit.
1.You may think sports will take up all your study time. But research shows that students who play sports do better than those who don’t. Exercise improves learning, and memory, which can help students become more active in the classroom.
It’s clear that people who play sports learn teamwork and goal setting skills.2.While working with teammates to win games and achieve goals, you’re learning how to be successful. Those skills make you good at work and in family life.
3. In addition to being fit and keeping a healthy weight, people who play sports are also less likely to smoke. And later in life, people who exercise are less likely to have cancer or some other illness.
Playing sports improves self- confidence. 4.Why? It builds confidence when you can practice, improve, and achieve your goal. Sports are also a feel-good activity because they help people stay and make new friends.
5.Playing sports can make you have less stress and help you feel a little happier. A person’s mood improves during exercise. Friends help improve your mood. And being on a team creates close relations between friends. It’s good to know your teammates will be on your side ---- both on and off the field!
A. Exercise cuts the pressure.
B. Sports are good for people’s health.
C. Sports teach people useful life skills.
D. People who play sports do better in school.
E. People who play sports feel better about themselves.
九年级英语补全短文5选5中等难度题查看答案及解析
Have you ever noticed that your fingertips are winked when you’ve just finished swimming or washing dishes? It seems as if your hands have aged 30 years in a second. But is this an accident? Or is it something that nature has built into our bodies?
If your finger’s wrinkling up had no use at all, “ it wouldn’t need to.” Professor Tom Smulders from Newcastle University, UK, told BBC News. By studying wet fingers closely, Smulders and his partners found that the wrinkles looked a bit like the patterns on the car tire or on the bottom of the running shoes. So they made a guess that wrinkles on fingers might be able to help the hand hold things more tightly.
To test this, researchers asked 20 people to pick up marbles from water with their hands. But before they started, some of the people had to keep their hands in water for half an hour.
The researchers found that the people with wrinkled fingers completed the task the task faster than those with dry hands. But when they were asked to move dry marbles, all the people performed equally well, no matter they had the wrinkled fingers or not.
Our ancestors might not have played with marbles, but wrinkled fingers could have made it easier for them to climb around in the wet forests and catch fish from rivers, researchers say.
Similarly, our toes also get wrinkled in water. This may have developed from our ancestor’s need to run on wet ground.
But the question is, if wrinkled fingers are so helpful, why don’t our hands just stay that way all the time? Researchers explained that wrinkling has its disadvantage: wet fingertips are far less sensitive than smooth ones, reducing our sense of touch.
1.What does the underlined world “this ” in the third paragraph refer to?
A. Whether fingers have wrinkles after they are put in water.
B. Whether wrinkled fingers can hold things more tightly.
C. Why keeping things in water makes them wrinkled.
D. Why wrinkles help hands hold things more tightly.
2.The test shows that ________.
A. winkled hands hold dry things more tightly than dry hands do.
B. dry hands hold dry things more tightly than wrinkled hands do.
C. winkled hands hold wet things more tightly than dry hands do.
D. dry hands hold wet things more tightly than wrinkled hands do.
3.What might be the disadvantage of wrinkled fingers?
A. They are too sensitive to be touched.
B. They might be more likely to get hurt.
C. They cannot hold things tightly enough.
D. They are not so sensitive as dry fingers.
九年级英语阅读理解困难题查看答案及解析
When you sleep, do you ever realize that you are dreaming? If yes, then you sometimes have a lucid dream(清醒梦) 1.. Only some people are able to have them. Now scientists have found ways to help more people to have lucid dreams, Live Science reported.
Denholm from the University of Adelaide in Australia found that certain skills are key to helping people have lucid dreams. First, people can train themselves to find out whether they are dreaming or not. For example, someone may look at a clock, look away, and then look back.2.. Then, they might dream about this way while sleeping. However, in their dreams, the time on the clock may change very quickly. So people know they are dreaming.
Another way is to wake up after five hours of sleep.3.. During this time, repeat the words, ""The next time I'm dreaming, I ' ll remember that I'm dreaming " Then, go to bed again to enter rapid eye movement (REM,快速眼球运动) sleep. In REM sleep, people are more likely to be aware of their dreams.
In a lucid dream, people might study a hobby and then become better at it in real life. For example, you might learn to play the piano in a lucid dream. 4..
A.Then, stay awake for a while
B.The time should stay the same
C.it is hard for most people to have a lucid dream
D.Then, you might play the piano better in real life
E.Some people will need more time to fall asleep and have a dream
九年级英语补全短文5选4简单题查看答案及解析
-Is that you, Tom? When did you come back?
-An hour ago. You ________ the computer game.
A. have played B. were playing
C. played D. had played
九年级英语单项填空中等难度题查看答案及解析