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엑스트라

In this lesson, you will learn about one of the most significant American writers of the 20th century.

The most characteristic symptom of malaria is fever. The pathogen of the disease is spread by mosquitoes.

Statistics is a useful tool in many areas of life. Let's see how to use it.

In this lesson, you will learn about even and odd numbers.

Get a glimpse into the cruel world of pirates and learn about the dreaded sea bandits.

Copper is the third most widely produced metal.

비누는 일상생활의 위생에 없어서는 안 되는 용품이다.

This lesson is about the reproduction of plants.

Learn about the Manhattan Project, led by Robert Oppenheimer.

In this lesson, you can learn about scientific methods that help you calculate how many people were needed to build the pyramid.

In this lesson, you can learn about Wolfgang Amadeus Mozart, a child prodigy who became one of the greatest composers of all time.

In this lesson, you will learn the basics of electrical networks.

Menstruation is a natural part of the lives of girls and women from puberty until menopause.

이번 디지털 교재서는 올림픽 대회의 고대 전통, 그리고 세계정치가 올림픽에 미치는 영향에 대해서 배울 수 있습니다.

생태계의 관계들에 대해서 알아봅시다.

In this lesson, you can learn about everyday decisions and how they affect your emotional state.

Students can practise greeting teachers and other adults politely.

Students can practise introducing themselves by asking and answering questions about names, family, hobbies and friends.

In this lesson, you can learn about energy and sports drinks and their effects on the human body.

In this lesson, you can learn about the typical signs of abuse and how it differs from an everyday argument.

Students can practise talking about their hobbies and interests in a relaxed, social setting.

Students can practise asking and answering questions about the time, bus schedules and opening hours.

Students can practise asking for and giving directions to common places.