—_____do you think of Yinghe Cinema? —Great! It has ______service in the city. A. How, better B. How, the best C. What, better D. What, the best 答案:D用数字及符号表示(1)汞元素HgHg; (2)5个钠原子5Na5Na;(3)硫酸根离子SO42-SO42-; (4)相对分子质量最小的氧化物H2OH2O;(4)导致温室效应的气体CO2CO2;(5)水煤气的主要成分是H2H2和COCO.