题目内容

—Can’t you see a lion in the cage？

—________．

A. Yes，I can’t

B. No，I can’t

C. No，I can

D. Yes，you can’t see it

练习册系列答案
相关题目

— What’s the result of the examination?

— The teacher said that ________ of the students had passed the exam.

A. four five B. fourth fives C. fourth fifths D. four fifths

According to the new traffic rules, kids under 12 _________ sit in the front passenger seat of a car.

A. mustn’t B. can’t C. shouldn’t D. needn’t

At the shopping mall, you probably think about spending, not saving. Think about all the lights that keep the mall bright. Think about all the water faucets (水龙头) in the toilet. Think about all the air conditioning in summer. Saving energy is a hot topic for such a big place!

Many things at the mall use energy. Electric lights, infrared (红外感应) faucets and air-conditioners need electricity to work. One way to save energy is by keeping lights clean. More and more dust and dirt make the lights less bright. When malls keep lights clean, they can use fewer lights and keep the area just as bright, Using fewer lights means using less energy.

You step up to the water faucet. The water starts to flow. You don't have to touch a thing. Why do malls have such fancy faucets? The answer is simple. They save water. Sometimes people forget to turn the water off after they wash. Infrared faucets turn themselves off.

The…

1._______ is a hot topic for a big mall.

A. To spend money B. To save energy

C. To keep the mall bright D. To buy things

2.The best title for the passage is _______.

A. Lights, faucets and air-conditioners B. Spending less money

C. Energy saving at the mall D. A hot topic

3.What will the fourth paragraph probably talk about?

A. How to save water when using infrared faucets in the mall

B. How to save energy when using air-conditioners in the mall

C. How to save money when shopping in the mall.

D. How to save time when shopping in the mall.

We are in the classroom, please _____ quiet.

A. be B. is C. are D. am

---_____ do you like giraffes?

---Because they’re very interesting.

A. What B. How C. Why D. Where

任务型阅读（每空一词）

It’s good for a family to learn how to prepare for a fire. Here are some suggestions:

Put a smoke alarm in the house. If there is smoke from a fire, the alarm will make a loud sound. The sound tells everyone to run out of the house at once.

Make escape (逃脱) plans. They should know all the ways out of the house. If there is a fire, everyone follows the plan to get out.

Buy fire extinguishers (灭火器) in the house. Everyone in the family should learn to use them correctly.

Practise for a fire. Everyone in the family should know the following fire rules:

* Don’t open a hot door! The fire can grow more quickly when opening the door.

* Stay close to the floor! The best air is near the floor because smoke rises(上升).

* What will you do if your hair or clothes start to burn? First, stop! Don’t run! The fire burns faster because of more air. Drop! Fall to the floor. Then roll! Turning over and over will make

the fire go out. Put a blanket around you to keep air away from the fire.

Title: Be1. for a Fire

Suggestions

Details(细节)

Put a smoke alarm

If a fire2., the alarm will make a loud sound to tell everyone to

3. the house at once.

Make escape plans

People should know all the ways out of the house and4. the plan to get out if there is a fire.

Buy fire extinguishers

Everyone in the family should know 5. to use them.

Practise for a fire

Don’t open a hot door

The fire can grow more quickly when _______6.) the door.

Stay close to the floor

You cam breathe(呼吸) the7.air near the floor because smoke rises

Stop!

Drop!

Roll!

★If you8., the fire burns faster because of more air.

★ 9. over and over, and you will make the fire go out.

★Put a 10.around you to keep air away from the fire.

Welcome to Happy Days Club (俱乐部). It is a great, fun and exciting.

Ball Game Center

You can play volleyball, tennis or other ball games here.

3:00 pm—8:00 pm

Tel: 375-4789

Swimming Pool

It's really cool!

4:00 pm—9:00 pm

Tel: 375-4753

Free (免费的) Classes

Drawing

8:00 am—12:00 am Tel: 375-4767

Dancing

1:00 pm—6:00 pm Tel: 375-4762

Children club

You can play or make friends here

Tel: 375-4766

1.If (如果) you want to play basketball, you can call ________.

A. 375-4753 B. 375-4789 C. 375-4766 D. 375-4762

2.You arrive at (到达) Happy Days Club at 8:00 pm. You can ________.

A. play volleyball B. swim C. dance D. draw

3.You can take the dancing class at ________.

A. 1: 00pm B. 8:20am C. 7:00pm D. 8:00pm

4.If you want to have more friends, you can go to ________.

A. Swimming Pool B. Ball Game Center C. Children Club D. Drawing class

5.Which of the following is TRUE?

A. You can go to the Ball Game Center at 9: 00pm.

B. You can swim in the morning in Swimming Pool.

C. It can take you five hours to have a drawing class.

D. You don’t need to pay for (付费) the drawing class.

Virtual (虚拟的) reality is a way to create a computer-made environment that brings the user into a virtual world. If you ever have put on a VR headset, you would know exactly what I am talking about. From an experiential view we do understand the idea, but what about the technical backend that goes into making it all possible? In this blog, we will understand the technology behind virtual reality and the basic terms about the development of a virtual ecosystem for a VR headset.

The primary subject of virtual reality is simulating (模拟) the vision. Every headset is to perfect their method to create an immersive (浸入式) 3D environment. Each VR headset puts up a screen or two in front of eyes, keeping the user away from any interaction with the real world. Two autofocus lenses (自动对焦镜片) are generally placed between the screen and the eyes that change based on eye movement and positioning. The vision appears on the screen either by using a mobile phone or HDMI line connected to a PC.

To create a truly immersive virtual reality, there are certain requirements — a frame rate (帧率) of at least 60 fps, a refresh rate and at least 100-degree field of view ( though 180 degrees is perfect). If either of these doesn’t work according to the standards, the user will experience too big of a time difference between their actions and the response from the screen. We need the response to be less than 20 ms ( 1/1000 second) to fool the brain which is achieved by joining all the above in the right proportion (比例). Another matter that needs to be looked at here is to prevent netsickness because of the differences between the frame rate and refresh rate.

Apart from the image, there are certain other things that go into creating an immersive VR experience, holding the user’s attention completely in the virtual environment. For example, sound effects, when put with the image, can create very attractive effects. By using a headphone and 3D sound effects, the user can totally believe in the virtual environment. While perfecting sound effects, proper care needs to be taken about the consistency (一致) between the pictures and the sound. If you start playing frightening music in the background of a happy scene, it will just put the user off.

In future, we will see rapid progress in creating a truly immersive digital experience. With leading players like Google, Microsoft, Oculus, and HTC making great efforts to improve the capabilities (性能), we are not far from achieving a virtual reality that would feel so much better than the real world. If you would like to develop a VR app for your business, then feel free to get in touch. With over 10 years of experience in mobile technologies, we can make every dream a reality.

1.A VR headset helps the user _________.

A. create the vision on the screen

B. understand the technical backend

C. better experience a 3D environment

D. keep interaction with the real world

2.The words "put the user off" in Paragraph 4 probably mean "__________".

A. take the user’s attention away

B. get the user interested

C. hold the user’s imagination back

D. help the user understand

3.What is the main purpose of writing this passage?

A. To give a short introduction of VR.

B. To do business with certain readers.

C. To predict the bright future of VR.

D. To share experiences with readers.

4.What can we learn from the passage?

A. The lower degree field of view, the better images.

B. Sound effects are more important than the image for VR.

C. Some big companies may create a VR better than the real world soon.

D. The brain can tell the time difference when the response is more than 20 ms.

违法和不良信息举报电话：027-86699610 举报邮箱：58377363@163.com

精英家教网