题干
What are you doing?
A：You are singing.
B：I am singing.
C：He is singing.
答案(点此获取答案解析）
B
mL溶有2.08 g BaCl2的溶液，再加入100 mL溶有0.010 mol CuSO4·5H2O的溶液，充分反应，下列说法正确的是（ ）
