[选修5--有机化学基础]下列化合物在核磁共振氢谱中能出现两组峰，且其峰面积之比为2：1的有（ ）
A：乙酸甲酯
B：对苯二酚
C：2﹣甲基丙烷
D：对苯二甲酸
89＋101=____+____+____=____
139＋58=____+____－____=____
Things made by hand are usually more expensive than produced in factories.
