(11-13)There are thousands of ways to solve it. It might take hours, or it may take seconds. Adults couldwork on it for days, but it’s so simple even a child can do it. The Rubik’s Cube has been keeping people’shands busy for many years.On the outside, the Rubik’s cube looks really simple. Each side has nine stickers in one of six colors.The sides can be moved around. To solve the puzzle, you have to make each side one color.The Rubik’s Cube was invented by a Hungarian named Erno Rubik in 1974. On a lazy summer’s day, hewatched the Danube River flow by. He noticed how the water made rocks smooth. That is how he got theidea to make the round inside of the cube. This is what lets the outside of the cube move.Rubik shared his finished cube with his students first and they loved it. By 1980, Rubik’s Cubes weretaken to everywhere in the world. In just two years, 100 million cubes were sold.Everyone wanted to know how to solve the cube. In 1981, 12-year-old Patrick Bossert wrote” You CanDo the Cube”. It sold over 1.5 million copies around the world. People also started holding Rubik’s Cubegames. The first world championship took place in 1981. Today, the world record for solving the cube isunder ten seconds.The Rubik’s Cube is still very popular. If you don’t believe it, just pick one up. Like many others,perhaps you won’t be able to put it down!Rubik’s Cube 魔術方塊 championship 冠軍
( ) 11. According to the reading, the Rubik’s Cube________ .
(A) is only popular with adults
(B) was invented by a teacher
(C) was named after a river
(D) has to be solved in a certain way