题目

 下列物质间的转化不能一步完成的是  A. KNO3→NaNO3      B. Mg→MgO      C. Na2CO3→NaOH      D. H2O→H2               答案：A— What do you think of Xu Fan's performance in the latest film Tang Shan Earthquake? — Fantastic! She _____ our expectations. [     ]A. put up with B. kept up with C. looked up to D. lived up to