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Gold is a precious metal. Gold is used as ornaments or as money.

     Gold is found in many places, but in a small supply. It is often found on the surface of the earth. Since gold is a heavy substance, it is sometimes found loose on bottom of rivers. The gold is found together with sand and rocks, and must be separated from them. It is simple to search for this type of gold.

     It is not usually necessary to drill for gold, but when a layer of gold is located deep below the surface of the earth, it is possible to drill a hole into the ground. Engineers have developed modern process for removing gold from rocks.

     Since gold is not very hard, it is sometimes melted and added to other substances for making rings, coins, and art objects. It will be priced forever because it is beautiful, rare, and useful.

The best title of the text above is …..

Gold is a precious metal. Gold is used as ornaments or as money.

     Gold is found in many places, but in a small supply. It is often found on the surface of the earth. Since gold is a heavy substance, it is sometimes found loose on bottom of rivers. The gold is found together with sand and rocks, and must be separated from them. It is simple to search for this type of gold.

     It is not usually necessary to drill for gold, but when a layer of gold is located deep below the surface of the earth, it is possible to drill a hole into the ground. Engineers have developed modern process for removing gold from rocks.

     Since gold is not very hard, it is sometimes melted and added to other substances for making rings, coins, and art objects. It will be priced forever because it is beautiful, rare, and useful.

“It will be priced forever because….” (Paragraph 4) The underlined word means …

A calculator was invented at 1970 . A long ago, abacus was the primitive form of it. It was the....

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A laptop is a kind of computer unit which has the same function as a PC (Personal Computer), but it’s smaller, lighter and of different sizes. Nowadays, most people choose laptops for several reasons.

A laptop is a portable device. This portability is very helpful for our work, study and other activities. We do not need complicated cable installations to activate a laptop. With a laptop, we can do our work anytime and anywhere.

Moreover, a laptop allows us to access the internet in public places which provide free access called hot spot areas. Some people like to use this facility to carry out their tasks.

Finally, a laptop consumes energy more efficiently than a PC does. This device uses a rechargeable battery as a source of electric energy. So, if we prefer using a laptop, it means that we support the government program to save energy. That’s why a laptop has become very popular recently.

From the text we know that ….

An electronic calculator is a small, portable electronic device used to perform both arithmetic operations and complex mathematical operations.

The first solid electronic calculator was created in the 1960 s, building on the extensive history of tools such as the abacus (developed around 2000 BC), and the mechanical calculator (developed in the 17th century AD). It was developed in parallel with the analog computers of the day.

In addition to general purpose of calculators, there are those designed for specific markets, for example, there are scientific calculators which include trigonometric and statistical calculations. Some calculators even have the ability to do computer algebra. Graphing calculators can be used to graph functions defined on the real line, or higher dimensional Euclidean space.

It was developed in parallel with the analog computers of the day. The underlined word refers to ...

An electronic calculator is a small, portable electronic device used to perform both arithmetic operations and complex mathematical operations.

The first solid electronic calculator was created in the 1960s, building on the extensive history of tools such as the abacus (developed around 2000 BC), and the mechanical calculator (developed in the 17th century AD). It was developed in parallel with the analog computers of the day.

In addition to general purpose of calculators, there are those designed for specific markets, for example, there are scientific calculators which include trigonometric and statistical calculations. Some calculators even have the ability to do computer algebra. Graphing calculators can be used to graph functions defined on the real line, or higher dimensional Euclidean space.

What is the main idea of paragraph 3?

A laptop is a kind of computer unit which has the same function as a PC (Personal Computer), but it’s smaller, lighter and of different sizes. Nowadays, most people choose laptops for several reasons.

A laptop is a portable device. This portability is very helpful for our work, study and other activities. We do not need complicated cable installations to activate a laptop. With a laptop, we can do our work anytime and anywhere.

Moreover, a laptop allows us to access the internet in public places which provide free access called hot spot areas. Some people like to use this facility to carry out their tasks.

Finally, a laptop consumes energy more efficiently than a PC does. This device uses a rechargeable battery as a source of electric energy. So, if we prefer using a laptop, it means that we support the government program to save energy. That’s why a laptop has become very popular recently.

A laptop has become very popular because …

The Internet is a computer-based global information system. The Internet is composed of many interconnected computer networks. Each network may link tens, hundreds, or even thousands of computers, enabling them to share information and processing power. The Internet has made it possible for people all over the world to communicate with one another effectively and inexpensively. Unlike traditional broadcasting media, such as radio and television, the Internet does not have a centralized distribution system. Instead, an individual who has Internet access can communicate directly with anyone else on the Internet, post information for general consumption, retrieve information, use distant applications and services, or buy and sell products.

The Internet has brought new opportunities to government, business, and education. Governments use the Internet for internal communication, distribution of information, and automated tax processing. In addition to offering goods and services online to customers, businesses use the Internet to interact with other businesses. Many individuals use the Internet for communicating through electronic mail (e-mail), retrieving news, researching information, shopping, paying bills, banking, listening to music, watching movies, playing games, and even making telephone calls. Educational institutions use the Internet for research and to deliver online courses and course material to students.

How do teachers use the internet for serving the students?