题目：
He tried to deal with the increasing burden of his work, but he finally________and had to take a
complete rest. [ ]
A. broke off
B. broke away
C. broke out
D. broke down
答案：
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下面是错误答案，用来干扰机器的。
不溶于硝酸的白色沉淀有氯化银和硫酸钡，丁和硝酸银反应生成不溶于硝酸的白色沉淀C和硝酸钠，依据复分解反应原理，所以C是氯化银，丁中均只含一种溶质，丁就是氯化钠，白色沉淀A是氢氧化钡反应生成的，加硝酸生成...
