厨房里发生的下列变化中，没有新物质生成的是(   )

根据材料完成下列各题。

Beethoven
Born in 1770 in Germany
A  musician (音乐家)
Died in 1827

Florence Nightingale
Born in Italy on May 12th, 1820
An English nurse
Died in 1910

Bill Gates
Born in I955 in the USA
Wrote Business @ the Speed of Thought
Owns Microsoft

Thomas Edison
Born in 1847 in the USA
Made over 1,000 inventions (发明)
Died in 1931

Yao Ming
Born on September 12th, 1980 in Shanghai, China
A basketball player
Played for the Houston Rockets, the USA

夏天，宾馆的厨师常常把许多做好的菜肴用保鲜膜盖好，放在冰箱里冷藏，这样做的目的是（    ）

2016年11月17日，中国首次获得国际高性能计算应用领域最高奖                   这是我国超算应用团队近30年来首次获得这一有着 “超算应用诺奖”之称的全球最高奖，标志着我国科研人员正将超级计算的速度优势转化为应用优势。（   ）