![](https://img.xkw.com/dksih/QBM/2021/9/2/2799322580557824/2803699305144320/STEM/901a2d98428d45108e1b3c40d3540562.png?resizew=153)
Do you know what makes lightning(闪电)?Why does lightning strike(击打)?
Lightning strikes happen when ice and water in clouds rub(摩擦)together, and cause atmospheric(大气层的)changes. When this happens, it creates a static charge(静电).Lightning can strike inside the cloud, between two clouds or between a cloud and Earth. It’s the last kind of strike that is the most dangerous for humans.
Lightning can be very dangerous. Every year, lightning kills people because it can start big fires or because it reaches a temperature of 28, 000 ℃. About 1, 000 people are hit by lightning every year in the United States, and about 100 of them die as a result.
Lightning makes people shocked, and it happens all over the world! Scientists think that there are more than three million lightning strikes every day in the world—that’s thirty strikes every second(秒). An American man Roy Sullivan, who worked in a park, survived from the most lightning strikes. Between 1942 and 1983, he was hit seven times! And he keeps the highest world record.
Lightning is sure not something to play with. When lightning strikes, it’s best to stay inside a large building. To stay safe, do not stand under trees, on hills or near water. Also, do not lie down on the ground, or the electricity may go through you and cause a heart problem.
1. Lightning strikes ________.A.happen thirty times each day | B.happen when there are big fires |
C.can reach a very high temperature | D.can kill all those who work in a park |
A.幸存 | B.选择 | C.遇难 | D.失忆 |
A.About 1000 people. | B.About 28,000 people. |
C.About one tenth of people. | D.About one fourth of people. |
A.Under a tree. | B.Near a river. |
C.On the top of a hill. | D.Inside a building. |
相似题推荐
Mudslide(泥流)!
LoAnna gathered everyone into the bedroom farthest from the falling hill side and waited.
Kris got a call from LoAnna, He hurriedly drove home.
Highway 530 was covered with thick sand, fallen trees. Kris had to run home.
The mud came up to his knees. Suddenly he heard a woman screaming for help. He pulled through mud, over pieces of houses to the source of the cries.
At first, he saw an arm reaching up through the debris. There, a woman, buried under pieces of walls. furniture, and trees. was holding a baby. Finally, he freed the baby. By this time, other citizens had come.
After saving the woman, Kris moved on. He was still a mile from home. Ahead lay two fallen houses. He heard a moan. Stepping toward the house, Kris nearly killed himself in the mud. An older man was trapped in house debris. He was twice Kriss weight. He'd have to wait for more help.
Just then, Kris heard another man moaning from the second house. Kris pulled away some pieces of the house, but the man was buried too deeply for him.
Hearing helicopter(直升飞机) on the roof, Kris climbed up, met a member of the search-and-rescue team and led him to the first man. Then he headed back and kept digging until he could turn the second man over. After the rest of the team arrived, Kris moved on to find his family.
Kris finally reached home. It was flooded, but the mud had stopped just shy of the house. His truck was gone, as were LoAnna and the others. He checked cars and houses nearby for survivors, then ran to the command center.
Not long after he arrived, he saw his truck coming down the road. LoAnna jumped out.
Kris was praised by the Red Cross for his heroics.
1. The purpose of the first two paragraphs is to .
A.create an unusual setting of the story |
B.introduce the central idea of the story |
C.describe a turning point of the story |
D.review the main character of the story |
a. Kris found a man buried too deeply for him.
b. Kris heard a woman screaming for help.
c. Kris led a rescue member to save the older man.
d. Kris found LoAnna, kids and his truck gone.
e. Kris was nearly killed in the mud.
A.beacd | B.badec | C.aecbd | D.aedbc |
A.Kris saved three persons in all. |
B.Kris saved the baby by himself. |
C.Kris pulled the first man out of mud. |
D.Kris found some survivors near his house. |
A.Kris got a call from LoAnna. |
B.He was still a mile from home. |
C.He saw his truck coming down the road. |
D.Kris was praised by the Red Cross for his heroics. |
【推荐2】You may hear about earthquakes, but do you know what to do before, during and after an earthquake? Here is some advice for you.
Before an earthquake
It is necessary to prepare yourself and your family. All family members should know how to turn off gas(煤气), water and electricity and know useful telephone numbers ( doctor, hospital, police and 119, etc.). Never put heavy things over beds.
During an earthquake
It is important for each of you to stay calm. If you are indoors, quickly move to a safe place in the room such as under a strong desk or table. The purpose is to protect yourself from falling objects. Stay away from windows, large mirrors, heavy furniture and so on.
If you are outdoors, move to an open area like a playground. Move away from buildings, bridges and trees. If you are driving, stop the car as soon as possible. Stay away from bridges and tall buildings. Stay in your car.
After an earthquake
Once the shaking has stopped, don't run out of the building at once. It's better to wait and leave when it is safe.
Check around you and help the people who are in trouble. If your building is badly broken, you should leave it. If you smell or hear a gas leak, get everyone outside and open windows and doors. If you can do it safely, turn off the gas. Report it to the gas company.
1. Which of the following is mentioned in the second paragraph?A.People should know how to turn on gas. | B.People should know how to save water. |
C.People shouldn't put heavy boxes over beds. | D.People shouldn't forget the phone numbers of others. |
A.standing still | B.staying cool | C.looking outside | D.moving indoors |
A.speed up your car | B.stop your car and stay in it | C.slow down your car | D.stop your car and get out |
A.check around you first | B.run out of the building at once |
C.break windows and doors | D.write a report to your company |
A.what an earthquake is like | B.what to do to avoid an earthquake |
C.how an earthquake happens | D.how to protect yourself in an earthquake |
![](https://img.xkw.com/dksih/QBM/2023/3/1/3185126875267072/3402741335613440/STEM/8ae7d91cbb934e01ad9a4b49bb8d80b4.png?resizew=142)
A fire first started in the mountains of Chongqing’s Beibei district (区域) on August 21st because of the long time hot weather. To fight with the fire in Beibei, a plane and some experts (专家) landed in Chongqing on August 23d to help with the wildfire. On August 26, several big wildfires (山火) have been brought under control with the help of motorcyclists (摩托车手) there.
The city government (政府) called for volunteers (志愿者) to join in the hard firefighting (消防), and quite a lot of motorcyclists volunteered to run (运送) much-needed things to the firefighters. “It is my honor (荣誉) and duty (责任) to help my hometown” said 27-year-old Li Xin from Yueqi Motorcycle Club. He is only one of them. They are called as “city heroes”.
1. When did the fire first start in the mountains of Chongqing’s Beibei district?A.On August 21. | B.On August 23rd. | C.On August 26th. |
A.指挥 | B.支配 | C.控制 |
A.They gave money and food to the government. |
B.They ran much-needed things to the firefighters. |
C.They rode motorcycles to help to put out the fire. |
A.In a newspaper. | B.In a story book. | C.In a magazine. |
With the development of times and the progress of society, computers are becoming more and more popular, we can quickly type beautiful Chinese characters through them. So people write less and less by hand. Many people even have forgotten how to write Chinese characters. What’s worse, students are paying little attention to it. So, should we spend time in practicing writing? Some people say that with computer we can write without a pen. Some people say that practicing writing is a traditional virtue (美德) of the Chinese nation and it should be carried forward.. According to a recent survey in a middle school, more than half of the students have poor writing.
Do students still write by hand? However, when the students are asked if they would like to improve their handwriting, most of them answered, “NO”, which is very upset.
Here are their reasons
Percentage | Reasons |
51% | They can type on computers |
29% | They are too busy to practice it |
14% | It’s useless |
6% | Others |
Percentage | Results |
17% | Have good writing |
55% | Have bad writing |
28% | Have so-so writing |
Actually, handwriting is necessary and important because we need it in our daily life. To have a good writing, you need to follow these suggestions.
Experiment (实验). Try using different styles of pens until you find the right one.
Get comfortable. Sit up straight and relaxed with your arms on the table.
Practice makes perfect. Practice it for a few minutes each day.
1. According to writer’s survey, popularity of computers might lead to students’ poor handwriting.2. 55 percent of students are not good at handwriting according to the passage.
3. 14% of the students are too busy to practice handwriting according to the passage.
4. There are 4 pieces of suggestions mentioned to have good handwriting in the passage.
5. The main purpose of the writer is to advise people to practice writing by hand.
【推荐2】Whether from news reports or social media(媒体)articles, you may know that 5G has come. 5G is the 5th generation(第五代)network. It is a new network after 1G,2G,3G and 4G. It can connect everyone and everything together. 5G networks have covered many cities in China. 5G means super-last data(数据)speed. One can download a two-hour movie for less than 10 seconds, and it is making our lives more and more convenient.
5G will make self-driving cars possible. For safety, self-driving cars need super-fast data transmission(传输)to communicate with their nearby environment.5G is just what makes self-driving cars achieve this. Airplanes will become “smart” in the near future. Passengers will be able to use 5G networks in the air to connect to the Internet or place orders for food and drinks.
5G will be a big help for students who take online classes. Many people live in poor areas in the world where there are no schools. But with 5G, this will change. Students all over the world will be able to see places like the Great Wall without leaving their rooms.
It will be also easier for doctors to treat patients remotely by 5G. It means caring for patients from far away The facts listed above are only a part of what 5G will make possible and popular. Just as in the early days of the Internet in the 1990s, few could see how it could change our life and the world. The same will surely be true of 5G. With 5G, many things do not seem like dreams anymore. Now let's get ready to say goodbye to 4G and welcome the coming of 5G.
根据短文内容选择最佳答案。
1. The underlined word “remotely” in the passage means ________ in Chinese.
A.高效地 | B.快速地 | C.远程地 |
A.15 seconds | B.8 seconds | C.10 seconds |
A.to be used freely |
B.to connect everyone and everything together |
C.to make life more convenient than 4G |
A.We don't use 4G now in our daily life. |
B.The writer is worried about the coming of 5G. |
C.With 5G, some of our dreams will come true one day. |
A.self-driving cars | B.online classes | C.hospitals without doctors |
【推荐3】Many people dream of traveling into the space. ________ That’s why astronauts shouldn’t spend more than six months on the International Space Station (ISS) at a time.
Muscle (肌肉) and bone loss. In a weightless environment, astronauts don’t need to use their muscles to support themselves, so their muscles start shrinking (萎缩). To keep their muscles strong, astronauts need to exercise about two hours each day on the ISS.
Sleep disorder (混乱). In space, the sun rises every ninety minutes. It is hard for astronauts to get used to this light-dark cycle when they sleep. Also, they need to sleep in a sleeping bag that is fixed to a wall, and it is uncomfortable. Astronauts now have individual sleeping pods (分离舱) that help shut out some of the light. Still, studies have found that most astronauts only sleep about six hours each night, even though they should have eight and a half hours.
Brain changes. Scientists have found that the position (位置) of the brain changes during spaceflight. It can affect (影响) how the brain deal with how we see, stay balanced and move around. That’s why some astronauts can’t control their movement and balance after returning to the earth. Scientists have also found that astronauts may get used to this change after going on more spaceflights. But they still need to do more research.
根据短文内容,选择最佳答案。
1. Choose the best sentence to fill in the blank “______” in Paragraph 1.
A.They want to know more about it. |
B.Spending time in space sounds like great fun. |
C.However, spending too much time in space may cause health problems. |
A.To shut out light. |
B.To avoid moving around. |
C.To stay warm at night. |
A.Scientists are not sure if astronauts can get used to this change. |
B.Scientists know nothing about the brain changes during spaceflight. |
C.Scientists are sure that astronauts will get used to this change. |
A.![]() | B.![]() | C.![]() |