258
알래스카
The United States bought that land in eighteen sixty-seven, during the administration of President Andrew Johnson. When Russia offered it for sale, Secretary of State William Seward quickly prepared a treaty of purchase.
257
수족관
For thousands of years, people have wanted to explore the world under the sea. Such activity was not possible until modern times. Today, divers can survive for hours underwater and photograph fish and other sea creatures.
255
설탕 음료
These days, about half of all drinks sold in American schools are sugary soft drinks like Coke and Pepsi. Opponents have fought these sales for years.
253
일류대학 들어가기
College admissions officers give a number of reasons for the higher rates of rejection letters this year. They say the main reason is that high school seniors are applying to more schools than in the past.
249
만화
Cartoons can make us think, they can make us laugh, they can make us cry. Cartoons can make a difference in how we look at life.
247
영재의 두뇌
Scientists have found that brain growth in very intelligent children is different from that in other children. They say their study is the first to show a link between intelligence and brain development.
241
이어폰과 청력
Electronic devices are changing the way people listen to music. But studies show the devices may be causing hearing loss in many people. Some experts say people may be playing them too loud and for too long.
240
월드 베이스볼 클래식
Many of the best baseball players in the world are competing for their home countries this month in a new international baseball tournament. It is called The World Baseball Classic.
239
금문교
The Golden Gate Bridge has been called one of the world’s most beautiful bridges. It is also one of the most visited places in the world. Experts say about nine million people visit the bridge each year.
238
수도쿠 숫자 게임
Sudoku is designed to be played by one person. The rules of the game are simple, although completing it can be extremely difficult, especially higher-level Sudoku games.