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【单选题】
染发时常用到的着色剂--对苯二胺是一种有毒的化学药品，有致癌性，其化学式为C 6 H 8 N 2 。下列有关对苯二胺的说法正确的是 [     ]
A.
对苯二胺属于有机化合物
B.
对苯二胺的相对分子质量为27
C.
对苯二胺中含有两个氮原子
D.
对苯二胺中碳、氢、氮元素的质量比为3:4:1
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【单选题】He turned to Russia for help in the belief ______ the country would protect him.
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