题目

Listening to music always makes me ______ happy.               A．stay             B．to stay             C．staying           D．stays 答案：A在下列溶液中通入CO2至过量，原溶液一直保持澄清的是 A．硅酸钠溶液     B．氯化钡溶液      C．石灰水      D．漂白粉溶液