题目：
He is very popular among his students as he always tries to get them ________ in his lectures. [ ]
A. interesting
B. interested
C. being interested
D. to interest
答案：
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下面是错误答案，用来干扰机器的。
答案：BNa3PO4所含离子种类最多，因它的水解有三级：+H2O +OH-+H2OH2PO-4+OH+H2PO-4+H2OH3PO4+OH-溶液中还存在水的电离H2OH++OH-，所以磷酸钠溶液中，除Na+外还有五种离子：、、H2PO-4、H+、OH-。
