问题
选择题
You just can’t imagine what a bad impression some Chinese left _____foreigners while travelling abroad, so it is necessary to impress _____ people the importance of good manners.
A. on, to B. on, on C. to, on. D, to , to
答案
答案：B
的电离程度比B溶液中水的电离程度小，则A的化学式是 ，B的名称是 。