题目

下列叙述正确的是        A．相同条件下，N2和O3的混合气体与等体积的N2所含原子数相等        B．等物质的量的甲基（—CH3）与羟基（—OH）所含电子数相等        C．常温常压下28 g CO与22．4 L O2所含分子数相等        D．16 g CH4与18 g NH所含质子数相等 答案：B An official _____ by some reporters on food problems in Shanghai yesterday.A. is interviewing　　 B.is interviewed 　　 C. was interviewing　　 D. was interviewed