Read the passage and choose the best answer: FOOD AROUND THE WORLD It isn't amazing how much time we spend talking about food? "Have you ever eaten ...?", "What do you have for lunch?" and so on. And yet, when you travel from one county to another, you find that people have quite different feelings about food. People often feel that what they eat is normal, and what other people eat is strange and silly. In most parts of Asia, for example, no meal is complete without rice. In England, people eat potatoes every day. In the Middle East, bread is the main part of every meal. Eating becomes a habit which is difficult to change. Americans like to drink a lot of orange juice and coffee. The English drink tea four or five times a day. Australians drink large amounts of beer and the French drink wine every day. The sorts of meat people like to eat also differ from one country to another. Horse meat is thought to be delicious in France. In Hong Kong, some people enjoy eating snakes. New Zealanders eat sheep, but never eat goat meat. The Japanese don’t like to eat sheep meat because of its smell, but they enjoy eating raw fish. So it seems that although eating is a topic that we can talk about for hours, there is a little common sense in what we say about it. People everywhere enjoy what they have always eaten, and there is very little we can do to change our eating habit.

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Read the passage and do the tasks that follow.

Li-Fi Technology

   Li-Fi technology is a new technology that transmits signals as light instead of radio waves. In urban areas where Wi-Fi networks become congested and there is a lot of noise in the signals, this technology is something that can be of immense use to an individual. The basic requirement of this technology is the available of light!

    Light is also an electromagnetic wave like radio waves. The only difference is that the former  has the ability to transmit data almost ten thousand times faster than latter! The basic process is quite simple to understand. An LED light bulb, any one at all, can be flicked on and off in order to be able to generate signals. A light sensor on a device picks up the digital information sent by the LED, which enables it to be processed by a computer.

     The question is whether anyone wants to go through the annoying experience of sitting under a flickering light bulb. This is the interesting part. The technology is focusing on make sure that the light bulb is flickered up to billions of times a second!  At that rate, the human eye simply cannot notice the light bulb being flicked on and off.

     However, everything comes with a disadvantage. The major disadvantage here is the fact that these signals cannot penetrate walls. So if you want to move from one room to another, you will need to have a wired bulb present in that room as well.

   An Estonian startup company called Velmenni took the technology out of the laboratories and brought it into the real-world offices, and industrial environments in Tallinn for the first time.

    Overall, this sounds like quite a development in the field of communication technology.