Is there intelligent (有智力的) life on other planets? For years, scientists said “no.” or “we don’t know.” But today this is changing. Seth Shostak and Alexandra Barnett are astronomers(天文学家). They believe intelligent life exists (存在) somewhere in the universe. They also think we sill soon contact these beings(人；生物).
Why do Shostak and Barnett think intelligent life exists on other planets? The first reason is time. Scientists believe the universe is about 12 billion years old. “This is long enough for other planets to have intelligent life,” say Shostak and Barnett. The second reason is size—the universe is huge. “Tools like the Hubble Telescope(哈勃望远镜) have shown that there are at least 100 billion galaxies,” says Shostak. “And our galaxy, the Milky Way, has at least 100 billion stars. Some planets going around these stars might be similar to Earth.”
In the past, it was hard to look for signs of intelligent life in the universe. But now, powerful telescopes(高倍望远镜) allow scientists to discover smaller planets—the size of Mars or Earth—in other solar systems. These planets might have intelligent life.
Have beings from space already visited Earth? “Probably not,” says Shostak. “It’s a long way away. However, intelligent beings may contact us in other way, such as radio signals(信号). In fact, they may be trying to communicate with us now, but we don’t have the right tools to receive their messages. However, this is changing. By 2025, we could make contact with other life forms in our universe and we might help each other.”Seth Shostak and Alexandra Barnett are _____.
| A．astronomers | B．farmers | C．singers | D．drivers |
What is the best title for Paragraph 2?
| A．The Age and Size of Earth |
| B．Our Galaxy: The Milky Way |
| C．Why Intelligent Life Might Exist |
| D．Earth: The Only Planet with Intelligent Life |
Why was it hard to look for signs of intelligent life in the universe in the past?
| A．There were not any smaller planets. |
| B．There were not any powerful telescopes. |
| C．The astronomers were not interested in them. |
| D．The Milky Way didn’t exist at that time, |
Why haven’t beings from space visited us yet according to Shostak?
| A．They’re afraid of us. |
| B．It’s a long way away. |
| C．They don’t want to see us. |
| D．They don’t know how to use radio signals. |
What does the underlined phrase “life forms” in the last paragraph mean?
| A．Messages | B．Tools | C．Intelligent beings | D．Radio signals |
Can a green machine help the world's poorest kids learn better？Nicholas Negroponte thinks so.He and his team of scientists have invented a new type of computer.As a result，many children who live in poverty （贫穷） will have their own laptop computers!
Negroponte works at a university.He started a group called One Laptop Per Child （OLPC）.The people at OLPC don't work for money.They work to help children learn.OLPC makes computers that don't cost a lot.Then they sell the machines to governments of countries that have many people live in poverty.The governments then give the computes to kids for free.
The XO Laptop computers are made for school﹣aged children in developing nations.Many of these children live in faraway areas and go to schools with classrooms.In order to work，the laptops have to be lasting and student﹣friendly.
The machines have many fun characters like a built﹣in video camera，voice recording，and games.The WiFi lets students share information on the Web and read e﹣books.They also can make music and chat with friends.
Another great character is that it can last for a long time.It can be hand charged and also can be recharged by connecting to a solar panel.Because of these characters the XO laptops make learning fun while helping the environment.
The computers have a colorful name﹣"the green machine".Negroponte thinks they could make a difference in the lives of millions of kids.He says， "Every problem you can think of﹣poverty，peace，the environment﹣is solved with education."
OLPC plans to give out over ten million computers in the next few years.Kids in Thailand，Nigeria，Brazil，and Argentina will get most of them.China and Egypt also want to take part in the program.After that，Negroponte hopes to sell computers to other countries with high poverty.
（1）Negroponte thinks his laptop computers will help the world's poorest kids to .
A.work at home
B.go to school on time
C.learn better
（2）What can we know about the people at OLPC according to Paragraph 2？
A.They work for money.
B.They give computers to kids for free.
C.They sell computers to governments with many people living in poverty.
（3）Why do XO laptops make learning fun while helping the environment？
A.Because they are lasting and student﹣friendly.
B.Because they are made for school﹣aged children.
C.Because they have a colorful name.
（4）What does the underlined word " charged" mean in Chinese？
A.携带.
B.充电.
C.使用.
（5）Who will get most of the computers in the next few years？
A.Kids in Thailand.
B.Kids in China.
C.Kids in Egypt.
（1）41.0% of kids aged use the Internet.
A.5﹣9
B.10﹣13
C.14﹣17
（2）What percentage of kids gets news or information online？
A.89%.
B.76%.
C.38%.
（3）What do 43% of kids usually do on the Internet？
A.Play games.
B.Buy books.
C.Send or receive instant messages.
|
China's unbelievable high﹣speed rail network At the beginning of the 21st century China had no high﹣speed railways.Slow，crowded and often uncomfortable trains ran across this vast country，with low average speeds making journeys such as Shanghai﹣Beijing a test of travel. Today，it's a completely different picture.With 37，900 kilometers of lines，linking all of its major big cities.China has the world's largest work of high﹣speed railways.Half of that total has been completed in the last five years alone，with a further 3，700 kilometers due to open in the coming months of 2021.The network is expected to double in length again，to 70，000 kilometers，by 2035. |
（1）How were the trains in China at the beginning of the 21st century？
A.Fast.
B.Comfortable.
C.Crowded
（2）How many kilometers of lines are due to open in the coming months of 2021？
A.3，700.
B.37，900.
C.70，000.
John was born in 1838.When he turned 11 years old，his family moved to the United States from Scotland.They began a new life in Wisconsin that year.
John showed his love of nature in his early years.He liked playing outdoors.He also loved working outdoors on his father's farm.
When he was 29，John had an accident at work.The accident hurt his eyes.As a result he missed looking at nature for months.Luckily，he could see again.Later that year，John decided to spend all his time learning about nature.He would travel in order to make his dream come true.
First.John hiked 1，000 miles.He studied plants and wildlife He then took a trip by ship.It was to learn more about the world around him.In 1869，John went to the Sierra Nevada Mountains.He climbed the mountains and wrote down what he saw.And he wrote about the animals and plants as well.By the time John turned 33，people were reading what he had written.They realized the importance of nature from John's books.Many people understood and accepted his thoughts.
In 1852，John started the Sierra Chub.Many people joined it.They agreed that forest wildlife should be protected.Today，the club has more than two million members.It has a great influence on the people who love nature.They all help spread the ways to protect the environment.
John's books are still read today.He is famous for his love of nature.
根据短文内容，回答下列问题。
（1）Where did John and his family begin their new life？
（2）How did John show his love of nature in his early years？
（3）What was John's dream after he could see again？
（4）When did John go to climb the Sierra Nevadan Mountains？
（5）Why did John do things like taking trips，writing books and starting a club？（请用一句话作答）
German scientist think that your brain keeps working while you're asleep.To show that they were right，they gave two groups of students a problem to work out Group One went to sleep，and Group Two stayed awake. （1）
At the same time，from a recent study many children have missed out on 4.500 hours of sleep by the time they are seven years old.According to the Ministry of Education，primary school students should get at least 10 hours of sleep a night. （2） The answer is nine.If they don't get enough sleep at night，they will face more challenging situations in schoolwork.
Schools are taking action to make sure the students can get enough sleep.
（3） Three reasons are mentioned for the problem.Firstly they spend hours n scrolling（滚动），such as Douyin and Wechat Hours of watching the mobile phones can be harmful to their eyes and cause students to sleep less. （4） They may work overtime to get the job finished and they can't watch over he kids.Lastly，drinks like tea or coffee can also keep them excited and awake.
（5） For example，they should avoid using mobile phones too much，and drink something like milk before going to bed.
Only if schools，families and students join hands together，can students get enough sleep and be at their best in schoolwork.
阅读短文，把 A﹣E五个句子填入文中空缺处，使短文内容完整。
|
A.But researchers say many students still sleep less. B.In fact，students themselves should also take sleep seriously. C.Secondly，busy parents may not remind them to go to bed at the proper time. D.Then how many hours of sleep should junior high school students get a night？ E.The result showed the students who slept worked out the answer more quickly. |