构成物质的粒子之间的关系如右图所示。回答下列问题: 9 (1)甲是_________; (2)在水,汞和氯化钠三种物质中,由原子构成的物质是_________; 保持水化学性质的最小粒子是_____________。 (3)下图是CO与O2反应的微观示意图,反应前后没有发生变化的粒子是 (填选项); A.①② B.②③ C.③④ D.④⑤ 发生反应的化学符号表达式为 。 —____________ you_________ the editor at the airport? —No, he__________ away before my arrival. A. Have... met; has driven B. Had... met; was driven C. Did... meet; had been driven D. Have... met; had driven