Look and write. (连词成句) 1. nice, meet, you, to (.) 2. do, Sunday, you, did, last, what (?) 3.is, colour, your, what, favourite (?) 4. now, time, it, is, what (?) 5. go, how, to, do, school, you (?)
【简答题】“三鹿奶粉”事件震惊中外,其中罪魁祸首是在奶中加入了一种物质--三聚氰胺,长期摄入三聚氰胺会造成生殖、泌尿系统的损害,膀胱、肾部结石,并可进一步诱发膀胱癌.三聚氰胺的化学式为C 3 H 6 N 6 ,它是由______种元素组成,该分子中碳、氢、氮原子的个数比为______,含氮元素的质量分数为______.(可能用到的相对原子质量:C:12,N:14,H:1)