【简答题】化学是在( )、( )水平上研究物质的组成、结构、性质及其变化规律的一门基础自然科学。
【简答题】Jack always seems to so confident, but______ reality he's very shy.
【简答题】根据所学知识,完成下列问题: (1)化学是在______的水平上研究物质及其变化规律的一门基础自然科学,它能指导我们更好地认识、______物质. (2)化学变化是改造物质世界的重要途径之一.通过化学变化可以实现物质与能量的相互转化. ①镁条在空气中燃烧生成的新物质是______(填物质名称);同时将化学能转化为______能和______能. ②举出一个储存能量的化学变化的例子______.
【简答题】My mind seems always to return to the day when I met Carl. The city bus stopped at a corner to the passengers(乘客).1 was included. After getting on the bus, I looked for a place to sit. At last, I foun...
【单选题】Jack seems like a good student. He is always the first his work.