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(20分)
20-1～20-3题为选择题，每小题3分，在每小题给出的四个选项中，只有一项是符合题目要求的。20-4题为非选择题，请在答题纸相应位置做答。
20-1．下列有关肥皂的叙述中错误的是：
A．肥皂与纯碱的去污原理相同
B．肥皂可以加速油污在水中的分散
C．肥皂是油脂在碱性条件下水解生成的
D．肥皂主要成分的分子中含有亲油基团和亲水基团
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