Everyone can play an important part in societ...

Everyone can play an important part in society. As members, we should try our best to do __　　　 .

A. how we should do　　　　　　　　　　　　　　 B. what should we do

C what we should do　　　　　　　　　　　　　　　　 D. how should we do

九年级英语单项填空困难题查看答案及解析

Everyone plays an important part in society.　 As members, we should try our best to do

　　　　 to make the world better and better.

A. what we should do

B. what should we do

C. how we should do

九年级英语单选题困难题查看答案及解析

Everyone can play an important role in the society. As members, we should try our best to do________.

A.what we should do B.what shuuld we do

C.how we should do D.how we should do

九年级英语单选题中等难度题查看答案及解析

E-mail, as well as telephones, 　　　　 an important part in daily communication.

A. is playing　　　　　 B. have played

C. are playing　　　　 D. play

九年级英语单项填空中等难度题查看答案及解析

Friends play an important part in our lives, and although we can’t be more familiar with the fact of friendship, we often don’t clearly understand how we make friends, especially with Americans. Here are some pieces of advice on making friends with Americans:

* Visiting places Americans enjoy: parties, churches, restaurants, parks and sports clubs.

* Be willing to take the first step. Don’t wait for them to get close to you. Americans in China may not know you speak English. They may be uncomfortable if they can’t speak your language.

* Use small talks to open the conversation. Ask them where they’re from, why they come to China, etc. Remember: Be careful not to ask personal questions about age, salary and so on.

* Show an interest in their culture, their country or their job. Americans like to talk about themselves.

* Invite them to join you for dinner or just for coffee or tea. Try to set a specific （明确的）time. Americans sometimes make general invitations like “Let’s go out for a dinner sometime.” Often this is just a way to be friendly. It’s not always a real invitation.

* Don’t expect too much at first. Maybe they’re being friendly. But maybe they want to be your good friends. It will take time to tell.

1.According to the passage, Americans like to visit the following places except ______.

A．shopping centers   B．parks             C．sport clubs        D．churches

2.How many pieces of advice does the writer offer on making friends with Americans?

A．Four.             B．Five.             C．Six.              D．Seven.

3.What should you say when you meet an American for the first time?

A．What’s your age?

B．How much do you get in a month?

C．Nice to meet you! Are you from America?

D．Let’s get together sometime. I want to ask you some questions.

4.Which is the best way to make friends with an American?

A．To ask him if he is willing to make friends with you.

B．To spend a long time learning about him.

C．To wait until he tells you his thoughts.

D．To ask him to join you for dinner.

5.What do we know from the passage?

A．It’s very important to be a good friend of an American.

B．It’s difficult to get on with Americans.

C．Different peoples have different customs and cultures.

D．Friendship is the most important in our daily life.

九年级英语阅读理解中等难度题查看答案及解析

Pop is such an important part of society ______ it has even influenced our language.

A．as　　　　　　　　 B．that　　　　　 　 C．which　　　 　 D．where

九年级英语单项填空中等难度题查看答案及解析

Everyone has an important role in society. In this time of public crisis（危机）, it’s important that each of us sticks to our roles and plays them well. What can common people do in this crisis? How are the Chinese people taking on their special responsibilities? Here are some of the examples.

The novel coronavirus（新冠病毒）made this year’s Spring Festival very different for most of us. Many places in China began a first-level emergency (突发事件) response to the virus at the end of January, calling for people to stay at home. Following these rules, most people gave up family dinners during the Spring Festival and canceled any festival celebrations.

“It’s the quietest Chinese New Year I’ve ever had,” Xin Jingrong, a 14-year-old student from Nanning, Guangxi. It was the first time that Xin’s grandmother had to put off her trip to Nanning and stay alone in her hometown.

The control all over China not only separates many families, but also　　　　　 ▲　　　　 . Many shops are closed, delivery services are slow, and wearing masks in public has become a must. But people are showing their understanding and cooperation (合作).

Tong Zexi, a 15-year-old student from Harbin, has not gone out in more than 20 days. “I know I need to protect myself and cause no trouble. In this key time, when one gets sick, many others could be influenced.”

More than simply following the rules, some people have done amazing things to help fight the outbreak. On Feb 3, Zhao Junyan, a Junior 2 student from Shanghai, brought 15,000 masks from Indonesia back to China, People’s Daily reported. Zhao, while traveling in Jakarta, collected the masks with his uncle, who works in the city. The 15-year-old gave away all of the masks to Cangnan, Zhejiang, his hometown. “When a country is in trouble, everyone is responsible to help,” Zhao said to the reporter. “What I have done is what an normal Chinese person can possibly do.”

As a popular speech says nowadays, “We are all fighters!” Everyone has his or her role to play in this fight. And it’s believed that we can soon enjoy the warm sunshine and beautiful spring freely outside!

1.What do we know about Xin Jingrong?

A.Xin lives in Nanjing. B.Xin’s grandmother celebrated this Spring Festival alone.

C.Xin is a quiet person. D.Xin’s grandmother was unable to go back to her hometown.

2.In the fourth paragraph,which of the following sentence can be put in the 　　 ▲　　　　　　 .

A.cheers up many people B.makes the world more colorful

C.makes daily life inconvenient D.brings fears to people

3.If we put the passage into three parts, which of the following is the best?

(①=para.1 ②=para.2 ③=para.3 ④=para.4 ⑤=para.5 ⑥=para.6 ⑦=para.7)

A.①②③;④⑤⑥;⑦ B.①;②③④⑤⑥;⑦

C.①②;③④⑤;⑥⑦ D.①;②③④;⑤⑥⑦

4.The story is mainly about________.

A.what teenagers do to enjoy themselves at home in the crisis

B.what Chinese people do to take on their responsibilities in the crisis

C.how Chinese New Year was celebrated this year during the Spring Festival

D.how common people’s lives are changed by the virus in the crisis

九年级英语阅读单选中等难度题查看答案及解析

Bacterial Quorum Sensing

Bacteria(细菌)play an important role in our lives. They can keep us alive as well as make us sick. It wasn’t until fairly recently that we learned bacteria can communicate with one another.

In the 1960s, researchers found that a kind of bacteria called Vibrio fischeri（费氏弧菌） produced no light when they were alone, but that they exhibited great amount of light as the bacterial population grew to a certain number. How did this happen? How can Vibrio fischeri tell the difference between times when they’re alone and times when they’re in a community, and then all do something together?

Researchers found they talk to each other with a chemical language—signal molecules(信号分子). Vibrio fischeri makes signal molecules, and it also has a receptor on its surface that fits like a lock and key with a signal molecule. As the bacteria increase, more and more signal molecules are sent into the environment. When signal molecules increase to a certain amount, they lock down into those receptors and information comes into the bacteria, which tells them how many neighbors there are. As soon as they realize the population has hit the certain number, all of the bacteria behave as a group, making light together. In the past ten years, researchers have found all bacteria have systems like this: they make and recognize chemical words, determine(判断)the size of the community, and carry out tasks that would be unsuccessful if a single one were to act alone. This process is called quorum sensing.

Most of the time, bacteria live with thousands of other species (种类)of bacteria. There has to be a language of interspecies communication. In fact, bacteria have another kind of signal molecule, which is the common language used by all species. Moreover, this kind of molecule has its own receptor. In this way, bacteria are able to count different populations, and then they decide what task to carry out depending on which species has the greatest population.

Knowing how bacteria communicate could influence how we fight disease. What if bacteria can’t talk or hear? They won’t recognize when there are enough bacteria and when to exhibit the group behavior to make us sick. Researchers are developing a method—to make molecules that look like the real ones and then they lock into the receptors to jam recognition of the real situation.

On the other hand, researchers also improve the conversation of the beneficial bacteria, so they can do things that we want them to do better than they would do on their own.

1.According to the passage, what can we learn about quorum sensing?

A.Quorum sensing may happen when there is only one Vibrio fischeri.

B.Signal molecules are kept away from receptors during quorum sensing.

C.Most bacteria have similar systems to make light during quorum sensing.

D.Bacteria carry out a group task when their population hit a certain number.

2.What can we learn from the passage?

A.The more species there are, the more group actions bacteria will take.

B.In different environments, bacteria have different interspecies languages.

C.Beneficial bacteria communicate better by themselves than harmful ones.

D.To fight disease, researchers try to turn off the communication between harmful bacteria.

3.The passage is mainly about ________.

A.why bacterial population grows B.how bacteria communicate with each other

C.which bacteria help fight disease D.what scientists do to find quorum sensing

九年级英语阅读单选中等难度题查看答案及解析

It’s important for everyone to　　　　　　 the battle against pollution.

A、take part in 　　 B、play part in　　　　 C、pay for

九年级英语单项填空中等难度题查看答案及解析

听短文，选择正确的答案。短文读两遍。

1.Now we know that music ________ almost everyone’s life.

A.plays an important part in

B.have nothing to do with

C.take part in

2.People become interested in pop music ________ .

A.when they go to school

B.when they go to high school

C.after they are adults

3.Music can make people ________.

A.both nervous and relaxed

B.neither rich nor poor

C.either happy or sad

4.The word “music” comes from the Greek word “muses” ________.

A.who are goddesses of the arts

B.which has special language

C.that has the same meaning as the English word “music”

5.Music is only one part of the arts________.

A.which has many spoken languages

B.that is very popular

C.which uses sounds differently

九年级英语听短文回答问题困难题查看答案及解析