题目

 —She looks very happy. She ______ have passed the exam.    —I guess so. It's not difficult after all. A. should       B. could        C. must       D. might 答案：C下列粒子在相应条件下可大量共存的是(　　)A.0.1 mol·L－1FeCl3溶液中：K＋、Na＋、SO、AlOB.＝1的溶液中：Fe2＋、NO、Al3＋、Cl－C.0.1 mol·L－1盐酸的澄清透明溶液中：Fe3＋、K＋、SO、Br－D.含有0.1 mol·L－1Ca2＋的溶液中：Na＋、Cu2＋、SiO、NO