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【题目】如果你想得到更多的信息，你可以打电话或发邮件给我们。

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【答案】If you want to get more information, you can call or email us.

【解析】

根据汉语提示可知，if如果；you你；want to get more information想得到更多信息；can可以；call打电话；or或者；email发邮件；us我们。故填If you want to get more information, you can call or email us.

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Ella had never seen a boat before. Although Ella was scared, she was curious(好奇的), too. She forced herself to swim to the surface. She saw several faces watching her. In fact, they looked very friendly. In the few months, Ella lost her fear of boats. People in the boats always enjoyed seeing her.

As time went by, people and boats became a part of her life. Whenever a boat passed overhead, she swam to the top to say hello. One night, Ella saw a lot of fish swimming around the bottom of a ship. Suddenly, she was caught by a fishing net. She fought hard to get free. Finally, she got away, but part of the net was tangled(缠住) in her mouth and around her tail. Ella was hurt and confused(困惑的). Slowly and sadly she made her way towards the deep ocean.

Many weeks passed, and the net in her mouth made it hard for her to eat. And every time she tried hard for air the net cut into her tail. But if she didn't get air every half an hour, she would die. Winter was coming, she had to move to warmer waters with others. However, this time she had no choice but to stay in the bay and wait to die.

One morning, to her surprise, the water was filled with boats. When the boats came closer, a person reached into the water. Soon many hands touched her. Ella felt them pulling the lines of the net. Moments later, she was free as before! The people were waving their starfish-shaped hands. Ella knew that the hands would always be there in her life.

【1】What passed over Ella's head one day?

【2】Why did Ella force herself to swim to the surface?

【3】How was Ella when she was caught by a fishing net?

【4】Where did Ella have to go before winter came?

【5】What happened to Ella after some people pulled the lines off her at last?

【题目】Each country has different rules about social situations. ________are what we can do.

①In Japan, we are supposed to kiss when we see each other.

②In Switzerland, we never visit a friend without calling first.

③In India, we can eat with our hands.

④In Mexico, we should bow when meeting for the first time

⑤In Colombia, it's OK if we arrive a bit late when we are invited to have dinner in a friend's house.

A.②③⑤B.②③④C.①④⑤

【题目】A: Alex, do you like to drive?

B: Sure. But I don't like to sit in traffic!

A: When I'm tired, I avoid driving.

B: I know. 【1】 I don't drive when the weather is bad.

A: So a self-driving car, would be really great.

B: A what?

A: A self-driving car. You can go to places at the push of a button (按钮).

B:【2】

A: Sure. Choose a place you want to go to and program the car. Then you push a button. And the car takes you there.

B: You don't have to do anything?

A: No.【3】

B: What a great invention! Just think. Blind people could use self-driving cars.

【4】

A: Right. Now many old people give up their cars because they're no longer safe drivers.

B:【5】

A: Yes.

A.It's not safe.

B.Would you like one?

C.You just enjoy the ride!

D.And old people could use them, too.

E.Could you please tell me how it works?

F.So self-driving cars are very convenient for them.

【题目】 Want to know what we can do to help make our city a better place to live in? Why not take part in “Clean & Green weekend”? Join us, and you can make new friends and help protect the environment at the same time.

Park Life

Do you like hanging out in the park with your friends? If so,why not take the chance to come with us and tidy up the park as you go? To add some fun, there is a gift for the person who collects the most rubbish! Meet us at the south entrance to Taohe Park at 9 a.m. next Saturday if you want to join in.

The Air You Breathe（呼吸）

A great way to make the air we breathe cleaner is by planting lots of trees! It is a fact that trees slowly filter（过滤）a lot of pollutants from the air. So come and help us plant some new ones in Fenhe Park at 2 p.m. next Sunday.

War on Graffiti（涂鸦）

Some people think graffiti is cool. Well, it is not! The best way to stop buildings from becoming totally covered in ugly graffiti is to get rid of it as soon as possible. And that is exactly what we are going to do. We are repainting the school walls from 1 p.m. on Saturday. You don’t have to bring any tools, just remember to wear some old clothes!

【1】The main purpose of “Clean & Green Weekend” is to________.

A.make our city more beautifulB.offer the chance to have fun

C.help students meet old friendsD.have a nice weekend

【2】If we’re going to repaint the school walls, we need to________.

A.draw pictures wellB.wear some old clothes

C.bring some tools with usD.wear some new clothes

【3】According to the passage, we know________.

A.graffiti can make the buildings look coolB.the person who collects rubbish can get a gift

C.we can plant trees to improve the environmentD.we can draw pictures on the wall

【4】We might read the above passage________.

A.in a fashion magazineB.on a school notice board

C.in a newspaper advertisementD.on a hospital notice board

【题目】 Has anyone ever told you that eating carrots will help you see in the dark?

This is just one of many incorrect beliefs you may have heard. Below, we have picked out scientific explanations for three mistakes that people make about their eyes. Let's take a look.

Can eating carrots improve your eyesight?

Carrots are rich in vitamin A, which helps the eyes to turn light into information for your brain. This allows people to see in darker places.

However, eating more carrots won't help you see better. A certain minimum amount will help, but a large number of carrots will not give you superhuman vision.

If your parents have bad eyesight, will you have bad eyesight, too?

Myopia(近视)can be passed from parents to children.

A study by the American Optometric Association found that if both parents are myopic, there's a 33 to 60 percent chance that their child will be. For children who have one parent with myopia, the chance is 23 to 40 percent. and it's down to 6 to 15 percent for kids with non-myopic parents.

So if your eyesight is bad, your children might still have good vision.

Do color blind people see the world in black and white?

Color blindness doesn't usually mean that people see the world like an old movie. They usually can't tell certain colors apart, especially green and red. Another commonly confused pair of colors is yellow and blue.

Our eyes have cone cells (视锥细胞) that sense different wavelengths (波长) of light. If these cells don't work properly, color blindness occurs.

There are different levels of color blindness. Some people are only color blind in low light.

However, in the most serious form of color blindness, everything is shades of gray.

【1】According to the article, eating carrots ________.

A.stops the brain from seeing

B.doesn't help you see better at all

C.will help you see clearly in the dark

D.is good for your eyes to some degree

【2】If both parents have myopia, their child's chance of having good eyesight is ________.

A.40-67%B.33-60%C.23-40%D.6-15%

【3】What is the cause of color blindness, according to the text?

A.Watching movies for too long.

B.Getting too little exercise.

C.Cone cells not working properly.

D.Changes in the wavelength of light.

【4】Which statement is RIGHT?

A.You can have superhuman vision after eating a large number of carrots.

B.If your parents have bad eyesight. You might still have good vision.

C.Color blind people see the world in black and white.

D.It's unnecessary to protect our eyes.

【5】What is the purpose of the article?

A.To offer some advice on protecting your eyes.

B.To clear up some misunderstandings about our eyes.

C.To provide help for improving your vision.

D.To explain how bad eyesight and color blindness form.

【题目】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 growsB.how bacteria communicate with each other

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

【题目】—Would you please give me a speech on Chinese traditional festivals tomorrow?

—_________, but I'm going to Guangzhou for a meeting.

A.It doesn't matter.B.Best wishes.C.Not at all.D.I wish I could.

【题目】 Infrared thermometers（红外温度计）, or temperature guns, have been widely used to detect（检测）the early symptoms of COVID-19. They allow us to measure（测量）temperatures quickly. How do these thermometers work?

They determine temperature by measuring the energy coming from your skin （皮肤）. Everything in nature has molecules （分子） inside of it that are always moving around. This include our skin. The higher the temperature is, the faster the molecules move. The molecules give off infrared light while moving.

This kind of light can be focused or absorbed（吸收）. The thermometers use a lens（镜头）to focus infrared light from the skin onto a detector called a thermopile（热电堆）. The thermopile absorbs the infrared radiation and turns it into heat. The electronic sensors inside the thermometers can measure the heat and read the temperature of the skin after making some calculations （计算）.

However, you might sometimes find that the results aren’t always accurate （准确的）. It depend on how these devices are used. For example, how far away they are held from the body, how steadily they are held and for how long. Factors such as make-up and sweat will also affect the results.

【1】Temperature guns, have been widely used to detect （检测）the early symptoms of____________.

A.COVID-17.B.COVID-18.C.COVID-19.D.COVID-20.

【2】They determine temperature by measuring the energy coming from your____________.

A.skinB.headC.faceD.foot

【3】The electronic sensors inside the thermometers can measure the heat and read the____________ of the skin.

A.colorB.temperatureC.lightD.structure

【4】Which one of the following might not affect the accurate results?

A.The thermometers is too far from the body.

B.The thermometers is held for very long.

C.Make-up and sweat.

D.The thermometer is held steadily at the right time.

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