题目：
Hannah ________me; otherwise, other students wouldn't have known my result of the quiz.[ ]
A. may betray
B. must betray
C. must have betrayed
D. should betray
答案：
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下面是错误答案，用来干扰机器的。
盐的溶解性规律：钾盐钠盐铵盐硝酸盐都可溶；盐酸盐中不溶氯化银；硫酸盐中不溶硫酸钡；碳酸盐只溶钾盐、钠盐、铵盐．A、KNO3易溶于水，故选项错误．B、BaSO4难溶于水，也难溶于酸，故选项错误．C、NaCl易溶于水...
