题目

互为同分异构体。在高中可以用来鉴别它们的方法是（   ）     A.质谱法        B.红外光谱法        C.与NaOH定量反应       D.核磁共振氢谱 答案：C. I can’t receive your phone call at 8 o’clock tomorrow, because I ____ the meeting. A am attending    B will attend     C will be attending  D am to attend