Topic 36: Inventions (Phần 2)

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Câu 1:

Most households in the UK will have a broadband connection and a lot of those houses will also have experienced connection or speed issues. But what if there was a way to connect to the internet and benefit from a direct connection with much faster speeds? Enter Li-Fi.

Li-Fi stands for Light Fidelity and is a Visible Light Communications (VLC) system which runs wireless communications that travel at very high speeds. With Li-Fi, your light blub is essentially your router. It uses common household LED light bulbs to enable data transfer, boasting speeds of up to 224 gigabits per second.

Li-Fi and Wi-Fi are quite similar as both transmit data electromagnetically. However, Wi-Fi uses radio waves, while Li-Fi runs on visible light waves. This means that it accommodates a photo-detector to receive light signals and a signal processing element to convert the data into “streamable” content. For example, data is fed into an LED light bulb, it then sends data at rapid speeds to the photo-detector. The tiny changes in the rapid dimming of LED bulbs is then converted by the “receiver” into electrical signal. The signal is then converted back into a binary data stream that we would recognise as web, video and audio applications that run on internet-enabled devices.

While some may think that Li-Fi with its 224 gigabits per second leaves Wi-Fi in the dust, Li-Fi’s exclusive use of visible light could halt a mass uptake. Li-Fi signals cannot pass through walls, so in order to enjoy full connectivity, capable LED bulbs will need to be placed throughout the home. Not to mention, Li-Fi requires the light bulb is on at all times to provide connectivity, meaning that the lights will need to be on during the day. Additionally, where there is a lack of light bulbs, there is a lack of Li-Fi internet so Li-Fi does take a hit when it comes to public Wi-Fi networks.

However, using Li-Fi instead of Wi-Fi, you’ll negate lots of security problems associated with shared and often overloaded broadband networks. It will also be advantageous in areas where radio frequency waves do not reach. Due to its impressive speeds, Li-Fi could make a huge impact on the internet of things too, with data transferred at much higher levels with even more devices able to connect to one another.

(Source: https://www.techworld.com/)

Which best serves as the title for the passage?

A. Wireless connection opens up a new world.

B. Everything you need to know about Li-Fi.

C. The technological waves are sweeping through.

D. The tech-savvy generation and their contribution.

Xem đáp án

Đáp án B

Câu nào sau đây thích hợp nhất làm tiêu đề cho đoạn văn?
A. Kết nối không dây mở ra một thế giới mới
B. Mọi thứ bạn cần biết về Li-FL
C. Làn sóng công nghệ đang quét qua
D. Thế hệ am hiểu công nghệ và sự đóng góp của họ
Căn cứ vào thông tin đoạn đầu:
Most households in the UK will have a broadband connection and a lot of those houses will also have experienced connection or speed issues. But what if there was a way to connect to the internet and benefit from a direct connection with much faster speeds? Enter Li-Fi.

(Hầu hết các hộ gia đình ở Anh sẽ có kết nối băng thông rộng và rất nhiều nhà cũng sẽ trả qua kết nối hoặc vấn đề về tốc độ. Nhưng có một cách để kết nối với Internet và được hưởng lợi từ một kết nối trực tiếp với tốc độ nhanh hơn nhiều? Dùng Li-Fi.)
Như vậy ta thấy đoạn văn đang đề cập đến Li-Fi.

Câu 2:

Most households in the UK will have a broadband connection and a lot of those houses will also have experienced connection or speed issues. But what if there was a way to connect to the internet and benefit from a direct connection with much faster speeds? Enter Li-Fi.

Li-Fi stands for Light Fidelity and is a Visible Light Communications (VLC) system which runs wireless communications that travel at very high speeds. With Li-Fi, your light blub is essentially your router. It uses common household LED light bulbs to enable data transfer, boasting speeds of up to 224 gigabits per second.

Li-Fi and Wi-Fi are quite similar as both transmit data electromagnetically. However, Wi-Fi uses radio waves, while Li-Fi runs on visible light waves. This means that it accommodates a photo-detector to receive light signals and a signal processing element to convert the data into “streamable” content. For example, data is fed into an LED light bulb, it then sends data at rapid speeds to the photo-detector. The tiny changes in the rapid dimming of LED bulbs is then converted by the “receiver” into electrical signal. The signal is then converted back into a binary data stream that we would recognise as web, video and audio applications that run on internet-enabled devices.

While some may think that Li-Fi with its 224 gigabits per second leaves Wi-Fi in the dust, Li-Fi’s exclusive use of visible light could halt a mass uptake. Li-Fi signals cannot pass through walls, so in order to enjoy full connectivity, capable LED bulbs will need to be placed throughout the home. Not to mention, Li-Fi requires the light bulb is on at all times to provide connectivity, meaning that the lights will need to be on during the day. Additionally, where there is a lack of light bulbs, there is a lack of Li-Fi internet so Li-Fi does take a hit when it comes to public Wi-Fi networks.

However, using Li-Fi instead of Wi-Fi, you’ll negate lots of security problems associated with shared and often overloaded broadband networks. It will also be advantageous in areas where radio frequency waves do not reach. Due to its impressive speeds, Li-Fi could make a huge impact on the internet of things too, with data transferred at much higher levels with even more devices able to connect to one another.

(Source: https://www.techworld.com/)

The word “boasting” in paragraph 2 is closest in meaning to _______.

A. looting

B. possessing

C. exaggerating

D. appreciating

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Đáp án B

Từ “boasting” trong đoạn 2 có nghĩa gần nhất với __________ .
A. cướp bóc
B. sở hữu
C. phóng đại
D. đánh giá cao
Từ đồng nghĩa boast = possess
It uses common household LED light bulbs to enable data transfer, boasting speeds of up to 224 gigabits per second.

(Nó sử dụng bóng đèn LED gia dụng thông thường để cho phép truyền dữ liệu, có tốc độ lên tới 224 gigabits mỗi giây.)

Câu 3:

Most households in the UK will have a broadband connection and a lot of those houses will also have experienced connection or speed issues. But what if there was a way to connect to the internet and benefit from a direct connection with much faster speeds? Enter Li-Fi.

Li-Fi stands for Light Fidelity and is a Visible Light Communications (VLC) system which runs wireless communications that travel at very high speeds. With Li-Fi, your light blub is essentially your router. It uses common household LED light bulbs to enable data transfer, boasting speeds of up to 224 gigabits per second.

Li-Fi and Wi-Fi are quite similar as both transmit data electromagnetically. However, Wi-Fi uses radio waves, while Li-Fi runs on visible light waves. This means that it accommodates a photo-detector to receive light signals and a signal processing element to convert the data into “streamable” content. For example, data is fed into an LED light bulb, it then sends data at rapid speeds to the photo-detector. The tiny changes in the rapid dimming of LED bulbs is then converted by the “receiver” into electrical signal. The signal is then converted back into a binary data stream that we would recognise as web, video and audio applications that run on internet-enabled devices.

While some may think that Li-Fi with its 224 gigabits per second leaves Wi-Fi in the dust, Li-Fi’s exclusive use of visible light could halt a mass uptake. Li-Fi signals cannot pass through walls, so in order to enjoy full connectivity, capable LED bulbs will need to be placed throughout the home. Not to mention, Li-Fi requires the light bulb is on at all times to provide connectivity, meaning that the lights will need to be on during the day. Additionally, where there is a lack of light bulbs, there is a lack of Li-Fi internet so Li-Fi does take a hit when it comes to public Wi-Fi networks.

However, using Li-Fi instead of Wi-Fi, you’ll negate lots of security problems associated with shared and often overloaded broadband networks. It will also be advantageous in areas where radio frequency waves do not reach. Due to its impressive speeds, Li-Fi could make a huge impact on the internet of things too, with data transferred at much higher levels with even more devices able to connect to one another.

(Source: https://www.techworld.com/)

According to paragraph 3, what form does the transferred data from Li-Fi system take?

A. The data is converted into electromagnetic radiation before being sent off.

B. The data initially is infrared ray and maintain the same type of wave along its travel.

C. The data is transferred through the brightness changes in the light beams.

D. The data takes the form of ultraviolet and then is converted into microwaves.

Xem đáp án

Đáp án C

Theo đoạn 3, dữ liệu được truyền từ hệ thống Li-Fi ở dạng nào?
A. Dữ liệu được chuyển đổi thành bức xạ điện từ trước khi được gửi đi.
B. Dữ liệu ban đầu là tia hồng ngoại và duy trì cùng loại sóng dọc theo hành trình của nó
C. Dữ liệu được truyền qua sự thay đổi độ sáng trong chùm sáng
D. Dữ liệu có dạng tia cực tím và sau đó được chuyển đổi thành vi sóng
Căn cứ vào thông tin đoạn ba:
However, Wi-Fi uses radio waves, while Li-Fi runs on visible light waves. This means that it accommodates a photo- detector to receive light signals and a signal processing element to convert the data into “streamable” content.

(Tuy nhiên, Wi-Fi sử dụng sóng vô tuyến, trong khi Li-Fi chạy trên sóng ánh sáng nhìn thấy được. Điều này có nghĩa là nó điều chỉnh một máy dò hình ảnh để nhận tín hiệu ánh sáng và một yếu tố xử lý tín hiệu để chuyển đổi dữ liệu thành nội dung truyền phát.)

Câu 4:

Most households in the UK will have a broadband connection and a lot of those houses will also have experienced connection or speed issues. But what if there was a way to connect to the internet and benefit from a direct connection with much faster speeds? Enter Li-Fi.

Li-Fi stands for Light Fidelity and is a Visible Light Communications (VLC) system which runs wireless communications that travel at very high speeds. With Li-Fi, your light blub is essentially your router. It uses common household LED light bulbs to enable data transfer, boasting speeds of up to 224 gigabits per second.

Li-Fi and Wi-Fi are quite similar as both transmit data electromagnetically. However, Wi-Fi uses radio waves, while Li-Fi runs on visible light waves. This means that it accommodates a photo-detector to receive light signals and a signal processing element to convert the data into “streamable” content. For example, data is fed into an LED light bulb, it then sends data at rapid speeds to the photo-detector. The tiny changes in the rapid dimming of LED bulbs is then converted by the “receiver” into electrical signal. The signal is then converted back into a binary data stream that we would recognise as web, video and audio applications that run on internet-enabled devices.

While some may think that Li-Fi with its 224 gigabits per second leaves Wi-Fi in the dust, Li-Fi’s exclusive use of visible light could halt a mass uptake. Li-Fi signals cannot pass through walls, so in order to enjoy full connectivity, capable LED bulbs will need to be placed throughout the home. Not to mention, Li-Fi requires the light bulb is on at all times to provide connectivity, meaning that the lights will need to be on during the day. Additionally, where there is a lack of light bulbs, there is a lack of Li-Fi internet so Li-Fi does take a hit when it comes to public Wi-Fi networks.

However, using Li-Fi instead of Wi-Fi, you’ll negate lots of security problems associated with shared and often overloaded broadband networks. It will also be advantageous in areas where radio frequency waves do not reach. Due to its impressive speeds, Li-Fi could make a huge impact on the internet of things too, with data transferred at much higher levels with even more devices able to connect to one another.

(Source: https://www.techworld.com/)

The word “accommodates” in paragraph 3 is closest in meaning to _______.

A. fits

B. helps

C. adapts

D. satisfies

Xem đáp án

Đáp án A

Từ “accommodates” trong đoạn 3 có nghĩa gần nhất với __________ .
A. làm cho phù hợp
B. giúp
C. thích nghi
D. thỏa mãn
Từ đồng nghĩa accommodate (điều chỉnh) = fit
However, Wi-Fi uses radio waves, while Li-Fi runs on visible light waves. This means that it accommodates a photo- detector to receive light signals and a signal processing element to convert the data into “streamable” content.

Câu 5:

Most households in the UK will have a broadband connection and a lot of those houses will also have experienced connection or speed issues. But what if there was a way to connect to the internet and benefit from a direct connection with much faster speeds? Enter Li-Fi.

Li-Fi stands for Light Fidelity and is a Visible Light Communications (VLC) system which runs wireless communications that travel at very high speeds. With Li-Fi, your light blub is essentially your router. It uses common household LED light bulbs to enable data transfer, boasting speeds of up to 224 gigabits per second.

Li-Fi and Wi-Fi are quite similar as both transmit data electromagnetically. However, Wi-Fi uses radio waves, while Li-Fi runs on visible light waves. This means that it accommodates a photo-detector to receive light signals and a signal processing element to convert the data into “streamable” content. For example, data is fed into an LED light bulb, it then sends data at rapid speeds to the photo-detector. The tiny changes in the rapid dimming of LED bulbs is then converted by the “receiver” into electrical signal. The signal is then converted back into a binary data stream that we would recognise as web, video and audio applications that run on internet-enabled devices.

While some may think that Li-Fi with its 224 gigabits per second leaves Wi-Fi in the dust, Li-Fi’s exclusive use of visible light could halt a mass uptake. Li-Fi signals cannot pass through walls, so in order to enjoy full connectivity, capable LED bulbs will need to be placed throughout the home. Not to mention, Li-Fi requires the light bulb is on at all times to provide connectivity, meaning that the lights will need to be on during the day. Additionally, where there is a lack of light bulbs, there is a lack of Li-Fi internet so Li-Fi does take a hit when it comes to public Wi-Fi networks.

However, using Li-Fi instead of Wi-Fi, you’ll negate lots of security problems associated with shared and often overloaded broadband networks. It will also be advantageous in areas where radio frequency waves do not reach. Due to its impressive speeds, Li-Fi could make a huge impact on the internet of things too, with data transferred at much higher levels with even more devices able to connect to one another.

(Source: https://www.techworld.com/)

The word “It” in paragraph 2 refers to _____.

A. Connection

B. Light bulb

C. Data

D. Li-Fi

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Đáp án D

Từ “it” trong đoạn 2 đề cập đến __________ .
A. Một kết nối
B. Bóng đèn
C. Dữ liệu
D. Li-Fi
Từ “it” ở đây dùng để thay thế cho danh từ li-fi được nhắc tới trước đó.
With Li-Fi, your light blub is essentially your router. It uses common household LED light bulbs to enable data transfer, boasting speeds of up to 224 gigabits per second.

(Với Li-Fi, ánh sáng của bạn về cơ bản là bộ định tuyến của bạn. Nó sử dụng bóng đèn LED gia dụng thông thường để cho phép truyền dữ liệu, tốc độ của nó lên tới 224 gigabits mỗi giây.)

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