题目

—The thread of my kite broke and it flew away.—I told you it would broke easily it was the weakest. A . where B . because C . that D . in which 答案：A3．未知物A的实验式和分子式都是C2H6O，A的红外光谱图如图（a），未知物A的核磁共振氢谱有三个峰图（b），峰面积之比是1：2：3．（1）未知物A的结构简式为CH3CH2OH．（2）A中的官能团名称是羟基．（3）在质谱图中，A的最大质荷比是46．