The world got a glimpse(一瞥) of one of the greatest mysteries of our universe(宇宙) on April 10.

    That′s when the first image of a black hole was shown to the public. The picture was created by a network of eight radio telescopes(射电望远镜).

    "We have seen what we thought was unseeable, "says Shep Doeleman. He led the effort to create the image.

    The black hole is at the center of galaxy (星系)named Messier 87, some 55 million light﹣years from the earth, and is 6.5 billion times the mass of the sun.

    The image shows the gas, dust, and stars that move around the black hole before disappearing into it. It does not truly show the black hole, because not even light can escape its gravity. Black holes, like vacuums, suck(吸)in everything that gets too close.

    When I was a little girl, my family lived in the countryside. There was a beautiful river near my home. The water was clean and cool. I liked to go fishing there with my mother. We would catch fish, look for clams(蛤)and play in the water. There were also a lot of birds near the river. We would spend all day watching the birds.

    Now my family live in the city. Last Sunday, my daughter asked me to take her to see the river I was always talking about. "I want to go fishing there so much with you and Grandma," she said.

    When we went to the river, we only saw a factory and a mountain of waste. My mother was surprised, my daughter was disappointed, and I was sad. The river was my best friend. I grew up with it. Now there are no fish in it, and the birds have gone too. I hear them crying for help. But what can I do?

    This is a street crossing. There are red and green lights at each corner. Drivers must watch the lights carefully.

    When there is a green light, the cars may go on. When there is a red light, the cars must stop.

    They must wait until the red light changes (变成)to green. Then they can go on. Sometimes the cars want to make a right turn or a left turn. They can make a right turn when the light is green or red. But they must wait until the green light is shining (闪亮) if they want to turn left. Some people are color-blind (色盲的). They can't see the difference (不同点) between red and green. These people mustn't drive, or there may be an accident (事故) .We must keep our street safe (安全的).

Harbin is known as "the City of Ice". Usually, it has heavy snow from the early November. It's time for Harbin to come to life and attract visitors all over the world. 

Harbin Ice and Snow World has been a business card since 1999. This 816,682-square-meter park is the largest ice and snow theme park in the world. Visitors can enjoy more than 1,000 artworks made of ice and snow. And also, they can try the super ice slide (滑梯). The number of the ice slides this year is increased from 8 to 14 and the longest one is 512 meters. 

Visitors from the south of China is a large part of the tourism crowd. Chen Ling, a visitor, said, "I'm from Guangzhou. I come here to enjoy the hot winter. My trip will last about a week. I hope I will have a great time!" However, the southern visitors may be less prepared for the cold. So the local government gives the most important suggestion: Pack enough warm clothes. The more, the better. A Harbin taxi driver said, "My wife works in a hotel. These days we're busy but we both feel very excited. Ice and snow are important parts of our city. All the visitors are sure to feel the enthusiasm (热情) of us. Welcome to my hometown!"

You may feel bored in winter sometimes. But Harbin Ice and Snow World can make the long, cold months beautiful and creative.

The Yellow River is one of the most well-known rivers in China. It plays an important part in Chinese culture. It is important to business and farming.

The Yellow River is the second longest river in China. A lot of famous longer rivers in Asia are in China or go through China. In Asia, the longest river is the Yangtze River and it is the third longest river in the world.

The Yellow River is the second largest river in China. Appearing for the first time in the Qinghai Tibetan Plateau (青藏高原), it passes east through nine provinces and empties into the Bohai Sea. It travels a journey of 5,464 kilometers and is the fifth longest river in the world.

The Yellow River is also called "The Mother River" by the Chinese people. Because its water contains a lot of sand, the water of the river gives a color of yellow. That's how the Yellow River gets its name.

Although the Yellow River has been the start of life in China, it has also caused floods. It's said that the worst flood happened during the Qing Dynasty. This flood killed a large number of people and was one of the worst natural disaster (灾害) in Chinese history.

"Am I an'I' person or an'E' person?" It is a popular topic among young people around China today. Many people are crazy about it so that they take a personality test named Myers-Briggs test to find out the answer.

Many people find the MBTI ( Myers-Briggs Test Indicator) useful. It groups people into 16 types, which start with the letter"I" or"E", such as"ENTJ, INFP" or more. "E" is short for"Extroversion" while"I" is for"Introversion". After testing, some say, "I'm extroverted, I should go to parties and make friends," while others think, "I'm introverted, I prefer working alone, maybeI' ll be a writer someday." They believe knowing their type can help them make quicker choices about activities, careers, and life paths.

However, there are some problems with the test. Some get different results when they retake it, and some find it hard to answer certain questions. For example, "I like watching TV alone, but I also enjoy hanging out with friends. Am I an'I' or an'E'?"

 When you take a personality test, you may think, "Oh, that's me." That's because the descriptions are generic. They can be used to describe many people. Research has found that over50% of people get a different score when they retook the MBTI just five weeks later. Personalities can change with time, and they are not black-or-white, scientists say. You may be introverted now but become extroverted when you get older. Or, you can be both an"I" and an"E". Don't label(贴标签) yourself! Studies have also shown that the test is not real at telling people's success in different jobs. So, don't take it too seriously.