关于2mol二氧化碳的叙述中,正确的是 A.质量为44g B.有4mol原子 C.分子数为6.02×1023 D.摩尔质量为44g/mol 答案:D 解析:1mol二氧化碳质量44克,有3摩尔原子,分子数是6.02×1023 根据括号内的汉语提示完成句子。1. We aim to _______ (提供) them with nice homes. 2. People have come to realize the _______ (重要) of protecting environment. 3. With the increase in population and the _______ (发展) of industry, litter is everywhere. 4. I often eat fresh fruit and vegetables _______ (代替) of chips and chocolate. 5. I think it is important to master computer _______ (技术) now. 6. I can't go shopping in a big store _______ (除非) I travel for a couple of hours.