如图，∠ACB=90°，AC=BC，AD⊥CE，BE⊥CE，垂足分别为D，E．

求证：△ACD≌△CBE．

C

    Many scientists think that life may be very different by 2050.

    First of all, TV might not be used by 2050. People will choose music, films, programs and newspapers on the computer. And they can smell(闻) and touch things on the Internet. That sounds really interesting.

    Water pollution(污染) will become the most serious problem by 2050. Human beings will need more water than today. There will be less fresh water on the earth.

    Cars will not only run on the land but also fly in the air by 2050. That can help to alleviate the heavy traffic. There won't be any accidents, because computers will control the traffic. What's more, the speed of the plane will be much faster. It'll take only 2 hours for people to fly from Los Angeles to Tokyo.

    Robots will become very popular by 2050, because they don't ask for money and can work 24 hours a day. We'll see robots everywhere — factories, schools, hospitals, shops and homes.

    By 2050, medicine will be improved a lot. Cancer and AIDs won't be serious diseases.

    Do you like Sun Wukong? He is one of the most popular novel(小说) characters in Chinese history. Both young children and adults love him so much. In our mind, he is a great hero in the Chinese novel Journey to the West(《西游记》).

    In the novel, Sun Wukong, Zhu Bajie and Sha Seng beat demons(妖魔) and protect Tang Seng when they travel to the Western Paradise(西天). Sun Wukong was born from a stone. He can change himself into a tree, a bird, or and animal. With one somersault(筋斗), he can travel 108,000li.

    Sun Wukong is clever, brave and always makes fun magic tricks. Chinese people love him very much.

    Sun Wukong is also popular in other countries. Many western children love him and learn kung fu because of him. To them, he is a super hero, just like Superman and Spiderman.