Wu Dajing won China's first gold medal at the 2018 Winter Olympics in PyeongChang. He broke world record in men's 500m short-track speed skating (短道速滑) on 22 February.

    World No. 1 Wu proved his ability in the event. He broke the world record twice. The young man won the gold medal with a time of 39.584 seconds. It raised our spirits. His performance was so perfect that even the other athletes showed respect for him.

    "I carried a lot of pressure into the final today after what we went through previously. I am just so proud of myself to bring out myself best in the race." said Wu. He won a silver medal at the 2014 Sochi Winter Olympics in Russia. "I really want to say 'Thank you' to my teacher. I just followed what she had told me before the final. I will still work hard and do better in the following races."

    Later, Wu and his teammates added another silver medal in the men's 5,000m team relay, bringing the Chinese delegation its ninth overall medal in the 2018 Winter Olympics in PyeongChang.

    Wu Dajing was born in Jiamusi in the north of China in 1994. He started short-track training at the age of 10. He used to train in Jiangsu and Jilin. He has become the most competitive athlete in the world and the hope for China.

东汉郑玄的著作《易论》认为“易一名而含三义：易简一也；变易二也；不易三也。”这句话总括了易的三种意思：“简易”“变易”和“恒常不变”。如日月的运行表现出一种非人为的自然，这是简易；其位置、形状却又时时变化，这是“变易”；然而总是东方出、西方落这是“不易”。这里的“变易”和“不易”分别表明（    ）

①万事万物都在运动

②运动变化是有规律的

③世界是绝对运动和相对静止的统一

④世界是对立统一的

下列与预防蛔虫病无关的卫生习惯是（  ）

美国当地时间2017年1月20日,          在美国首都华盛顿宣誓就职，正式成为美国第45任总统。（   ）

思维作坊。