题目

The new high-speed railway line between Urumqi, capital of the Xinjiang Uygur self-governing region，and Lanzhou, capital of Gansu province，has cut train travel time by half to less than 12 hours. The dramatic improvement will benefit many families planning reunions for Spring Festival. “For the first time，I feel home is not that far away after all，”said Liang Shaofu as he boarded a high-speed train in Urumqi with six members of his family．The 35-year-old left Lanzhou to set up a dry fruit business in Xinjiang eight years ago，and he has now settled in Urumqi．The 1,7化学就在我们身边，化学与我们的息息相关．(1)利用活性炭的____性可以除去河水的颜色和异味。(2)用肥皂洗衣服时发现泡沫很少，且有浮渣产生,这一现象说明当地的水为________(填“硬水”或“软水”)(3)化学反应前后，催化剂的_____都不变。(4)可燃冰具有能量高燃烧值大等优点，写出可燃冰燃烧的化学方程式______________。