Yuki Bhambri is one of the best tennis players in India. He was born (出生) in New Delhi in July, 1992. Yuki has a sporty family.____two sisters and a cousin are all good tennis players. Maybe because of that, Yuki started playing tennis young -- at the ____of six. It was soon clear that Yuki was more ____than many other players of his age.

    In 2008, Yuki played in the four Junior Grand Slam Tournaments (青少年大满贯锦标赛). They are quite important tennis games____ juniors He didn't win any of those games,____the world got to know the talented young tennis player. In the same year, Yuki won the Orange Bowl, another important tennis game in the world. He was the ____ Indian player to win that game. In 2009, Yuki won the Junior Australian Open. Then in 2010 he played in the first Youth Olympic  Games in Singapore and ____ the silver medal (银牌).

    There are not always happy and exciting moments (时光) in the tennis star' s life. Once Yuki had to stop ____an important game because of an injury. He felt sad. However, his love for tennis never ____ He takes every game seriously and ____the world that he is a really good tennis player.

在锥形瓶中加入质量为m的海螵蛸粉末，向分液漏斗中加入稀盐酸。在烧杯中加入足量氢氧化钠溶液，并称量烧杯及氢氧化钠溶液总质量m₁。

②先打开止水夹，再打开分液漏斗活塞，滴加盐酸并及时关闭活塞。完全反应后，

再次称量烧杯及其中液体的总质量m₂

③利用m₂与m₁的差值，即反应生成的二氧化碳质量，再计算海螵蛸中碳酸钙的含量。

推论：东汉发明了造纸术。