题目

For each blank in thefollowing passage there are four words or phrases marked A, B, C and D. Fill ineach blank with the word or phrase that fits the context.A recent article in TheWall Street journal says that Chinese students in American universities are notgetting the most out of their educational opportunities. The article says that 1 Chinese students work hard, many are notacquiring the soft skills that come with fully participating in campus life.Soft skills refer to thingslike socialization and learning to be 2. These are the skillsstudents develop by 3 socially with American and other i化学在环境保护中起着十分重要的作用。催化反硝化法和电化学降解法可用于治理水中硝酸盐的污染。（1）催化反硝化法中，H2能将NO3-还原为N2。25℃时，反应进行10 min，溶液的pH由7变为12。①N2的结构式为________。②上述反应离子方程式为____________________，其平均反应速率v（NO3-）为________mol·L－1·min－1。③还原过程中可生成中间产物NO2-，写出3种促进NO2-水解的方法________。（2）电化学降解NO3-的原理如图所示。①电源正极为________（填“A”或“B”），阴极反应式为______________。②若电解过程中转移了2 mol电子，则膜两侧电解液的质量变化差（Δm左－Δm右）为________g。