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 17^th 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 allows us….” (paragraph 1 line 1)

The underlined word has the opposite meaning with …

The Differences between report text and descriptive text

Fruits are a source of nourishing substances that keep us alive and healthy. For example, they contain many vitamins, especially vitamins A and C, and many minerals, such as calcium, potassium, and zinc. They also provide fiber for a healthy digestive system and carbohydrates that the body needs to make energy. They don‟t have a lot of calories to make us fat.

People use fruits for many things. We make juices from them. We cook bread and pie with them. We make jams and jellies and sweets. We freeze them to eat later. We even make alcohol from fruit. Beer comes from grains,wine comes from grapes, and some brandies are made from plums, apricots, or other fruits.

But most of the time, we don‟t do anything special with fruits. We eat them fresh, just as they are!

Which substance do we need to have a healthy digestive system?

Fruits are a source of nourishing substances that keep us alive and healthy. For example, they contain many vitamins, especially vitamins A and C, and many minerals, such as calcium, potassium, and zinc. They also provide fiber for a healthy digestive system and carbohydrates that the body needs to make energy. They don‟t have a lot of calories to make us fat.

People use fruits for many things. We make juices from them. We cook bread and pie with them. We make jams and jellies and sweets. We freeze them to eat later. We even make alcohol from fruit. Beer comes from grains,wine comes from grapes, and some brandies are made from plums, apricots, or other fruits.

But most of the time, we don‟t do anything special with fruits. We eat them fresh, just as they are!

“ We freeze them to eat later.” ( par.2 ) The word”freeze” in the sentence is similar in

meaning to ... .

Glasses—also called eyeglasses (formal), spectacles, or specs (informal)—are frames bearing lenses worn in front of the eyes, normally for vision correction or eye protection. Safety glasses are kind of eye protection against flying debris or against visible and near visible light or radiation. Sunglasses allow better vision in bright daylight, and may protect against damage from high levels of ultraviolet light. Other types of glasses may be used for viewing visual information (such as stereoscope) or simply just for aesthetic or fashion values.

Historical types of glasses include the pincers, monocle, lorgnette, and scissors or scissors-glasses.

Modern glasses are typically supported by pads on the bridge of the nose and by temple arms (sides) placed over the ears. CR-39 lenses are the most common plastic lenses due to their low weight, high scratch resistance, low dispersion, and low transparency to ultraviolet and infrared radiation. Polycarbonate and Trivex lenses are the lightest and most shatter-resistant, making them the best for impact protection.

An unpopular aspect of glasses is their inconvenience. Even through the creation of light frames such as those made of titanium, very flexible frames and new lens materials and optical coatings, glasses can still cause problems during rigorous sport, Visibility can be significantly reduced by becoming greasy, trapping vapour when eating hot food, swimming, walking in rain or rapid temperature changes (such as walking into a warm building from cold temperature outside). Scraping, fracturing, or breakage of the lenses require time—consuming and costly professional repair, though modern plastic lenses are almost indestructible and very scratch—resistant.

What is one good point of CR – 39 lenses?

A camera is an optical instrument for recording images, which may be stored locally, transmitted to another location, or both. The images may be individual still photographs or sequences of images constituting videos or movies. The functioning of the camera is very similar to the functioning of the human eye.

A camera may work with the light of the visible spectrum or with other portions of the electromagnetic spectrum. A still camera is an optical device which creates a single image of an object or scene, and records it on an electronic sensor or photographic film. All cameras use the same basic design: light enters an enclosed box through a converging lens and an image is recorded on a light-sensitive medium.

A shutter mechanism controls the length of time that light can enter the camera. Most photographic cameras have functions that allow a person to view the scene to be recorded, allow for a desired part of the scene to be in focus, and to control the exposure so that it is not too bright or too dim.

A movie camera or a video camera operates similarly to a still camera, except it records a series of static images in rapid succession, commonly at a rate of 24 frames per second. When the images are combined and displayed in order, the illusion of motion is achieved.

The word rapid in par.4 has similar meaning like…

Summer is a season which include the hottest and longest days in a year, among the four seasons, in its cycle. As a result, summer, which falls between spring and autumn, has the shortest nights, albeit the summertime may vary among countries due to climate and tradition. When summer is coming, the days lengthen.

In most countries in the nothern hemisphere, summer starts in June and ends in September. Meanwhile, summer occurs in December, January, and February in southern hemisphere.

During summer, the days are usually bright so people go holidaying, swimming, or sunbathing on the beach. Vegetables and tropical fruits, such as pineapples, watermelons, mangoes, berries, and melons, are abundant in summer.

Question:

What is the main idea of the second paragraph?

Summer is a season which include the hottest and longest days in a year, among the four seasons, in its cycle. As a result, summer, which falls between spring and autumn, has the shortest nights, albeit the summertime may vary among countries due to climate and tradition. When summer is coming, the days lengthen.

In most countries in the nothern hemisphere, summer starts in June and ends in September. Meanwhile, summer occurs in December, January, and February in southern hemisphere.

During summer, the days are usually bright so people go holidaying, swimming, or sunbathing on the beach. Vegetables and tropical fruits, such as pineapples, watermelons, mangoes, berries, and melons, are abundant in summer.

Question:

Why do people like to spend the day out in the summer?

Jasmine is a native flower to some tropical areas in South Asia, Africa and Australia. In India, some varieties of Jasmine are used for religious purposes.

The flower can grow up to 3 meters high and 2 meters wide. It releases its fragrance mostly after the sun sets especially nearing the full moon. Therefore, it is often associated with soothing night- time moods.

The planting of Jasmine is started by putting some cuttings in 3 inch posts within 4 weeks. After the roots grow, they are put into 6 inch pots. The soil in the pots should be kept moist but possible for the water to go through it for optimum growth.

There are some important advantages of Jasmine. In medication, this flower is often used for soothing headaches, stimulating brain, and restoring balance. Its extract is also widely used in the making of perfume.

Question:

When does Jasmine release the most fragrance?

Jasmine is a native flower to some tropical areas in South Asia, Africa and Australia. In India, some varieties of Jasmine are used for religious purposes.

The flower can grow up to 3 meters high and 2 meters wide. It releases its fragrance mostly after the sun sets especially nearing the full moon. Therefore, it is often associated with soothing night- time moods.

The planting of Jasmine is started by putting some cuttings in 3 inch posts within 4 weeks. After the roots grow, they are put into 6 inch pots. The soil in the pots should be kept moist but possible for the water to go through it for optimum growth.

There are some important advantages of Jasmine. In medication, this flower is often used for soothing headaches, stimulating brain, and restoring balance. Its extract is also widely used in the making of perfume.

Question:

What is the main idea of the last paragraph?

1.What makes Bornean and Sumatran Orang utan are different?

4. Why do Orang utans make nest in trees?

5. The powerful arms possessed by orang utans are useful for?