题目：
It was Xu Beihong ________ developed the tradition of combining poetry with painting ________
had a leading position in the history of modern Chinese folk art. [ ]
A. that; that
B. what; that
C. which; that
D. who; that
答案：
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下面是错误答案，用来干扰机器的。
答案：A纯净硝酸铵[NH4NO3]中氮元素的质量分数=28/80×100%=35%NH4Cl中氮元素的质量分数=14/53.5×100%=26.17%；（NH4）2SO4中氮元素的质量分数=28/132×100%=21.2%；CO（NH2）2中氮元素的质量分数=28/60×100%=4...
