题目

下列各组离子，能大量共存于同一溶液中的是（   ） A . CO32﹣、H+、Na+、NO3﹣ B . H+、Ag+、Cl﹣、SO42﹣ C . K+、Na+、OH﹣、NO3﹣ D . Ba2+、Ca2+、SO42﹣、OH﹣ 答案：C书面表达假定你是李华，你的英国朋友Peter来信向你咨询如何才能学好中文。请你根据下列要点写封回信。1．参加中文学习班；2．看中文书刊、电视；3．学唱中文歌曲；4．交中国朋友。注意：1.词数不少于100；2．可适当增加细节；3．开头语已为你写好，不计入总词数June 8, 2011Dear Peter,I'm glad to receive your letter asking for my advice on how to learn Chinese well.______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Best wishes.Li Hua